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(Click for frequent words.) 65 Seaglider 64 AUVs 63 Remotely operated 61 Hydroid 61 Autonomous Underwater Vehicle AUV 61 autonomous underwater 61 unmanned underwater 60 UUVs 60 Remotely Operated Vehicle 59 NAVOCEANO 59 vehicles AUVs 58 USVs 58 minehunting 58 echo sounders 58 ROV remotely 58 UUV 58 Jiaolong 58 VideoRay 58 Autonomous Underwater Vehicles AUVs 57 submersible craft 57 Slocum gliders 57 Autonomous Underwater Vehicles 57 multibeam 57 midget submarines 56 scanning sonar 56 Swean 56 RMMV 56 AN/AQS-#A 56 hydrographic survey 56 Autosub 56 manned submersible 55 AUV 55 Okeanos Explorer 55 HC #J 55 oceanographic survey 55 unmanned submersibles 55 mine countermeasure 55 MBARI 55 oceanographic vessel 55 multibeam sonar 55 unmanned rotorcraft 55 Aegis Combat 54 synthetic aperture sonar 54 Remote Operated Vehicle 54 Nautile 54 Remotely Operated Vehicle ROV 54 iRobot Warrior 54 Rigid Hull 54 BlueView 54 echo sounder 54 Unmanned Surface 54 moored buoys 54 Deep Submergence 54 vehicles UUVs 54 submersible Alvin 54 manned submersibles 54 Zodiac inflatable boats 54 Autonomous Benthic Explorer 53 Boeing P 8A 53 remotely operated 53 Heron unmanned aerial 53 Unmanned Underwater Vehicle 53 vehicles ROVs 53 Underwater Vehicle 53 Echoscope 53 sonar 53 submersible 53 SUGV 53 USS Mustin 53 Remotely Operated Vehicles ROVs 53 sidescan sonar 53 AquaShield 53 SH #B Seahawk 53 Super Scorpios 53 Naval Oceanographic 53 sonars 52 SOLO TREC 52 Argo floats 52 Hawaii Undersea 52 Aegis destroyer 52 Navy P 8A 52 unmanned undersea 52 BQM #E 52 underwater robot 52 autonomous robotic 52 P3 Orion 52 Underwater searchers 52 GHMD 52 Kongsberg Maritime 52 Mannert L. Abele 52 Aegis Destroyer 52 USS Safeguard 52 missile frigate USS 52 ScanEagle 51 electromagnetic railgun 51 minesweeping 51 semi submersible vessel 51 SPY 1F 51 LAV A2 51 HARBOR BRANCH 51 Remora 51 Remote Operated Vehicle ROV 51 #,# ton Samidare 51 geophysics prospecting 51 inertial navigation system 51 SUAV 51 HMS Investigator 51 DEPTHX 51 HMCS Montreal 51 Aegis Weapon System 51 robotic submarine 51 Marport 51 Wave Glider 51 Mounted Warrior 51 USS Antietam 51 Northrop Grumman Sperry 51 Institute MBARI 51 unmanned airborne 51 SARSAT 51 bathyscaphe 51 allied navies 51 KC #J Hercules 51 Seatronics 51 RNZAF Orion 51 TruLink 51 Navy destroyers 51 submersibles 51 Bluefin Robotics 51 sonobuoys 51 ship Pourquoi Pas 50 hydrographic surveying 50 rigid hulled inflatable 50 Heron UAV 50 Unmanned Ground Vehicle 50 drifting buoys 50 rebreathers 50 KDX III 50 LFA sonar 50 RNZN 50 Next Generation Jammer 50 M#A# Abrams Main 50 unmanned submarines 50 bathymetric 50 German battleship Bismarck 50 PEO IWS 50 Bonhomme Richard 50 Wallops Island Va. 50 Aerosonde 50 P 8A MMA 50 unmanned reconnaissance aircraft 50 MH #R aircraft 50 G ATOR 50 MDSU 50 robotic lander 50 Tactical Trainer 50 USNS Kanawha 50 USS Milius 50 MH #R helicopters 50 MQ 8B Fire 50 ROV 50 Orbiter LRO 50 HMCS Whitehorse 50 Multibeam 50 STP S# 50 INS Subhadra 50 JOIDES Resolution 50 Coast Guard icebreaker 50 J UCAS 50 USS Salvor 50 Expeditionary Warfare 50 Fleet Numerical Meteorology 50 PackBot robots 50 IODP 50 MDARS 50 Convection Rotation 50 AN/TPS-# 50 unmanned submersible 50 Forward Looking Infrared FLIR 49 Underwater Inspection 49 Orbital Express 49 Vehicles UAVs 49 JMSDF 49 guided munition 49 Naval Ship 49 shipwreck hunter 49 SH #B helicopter 49 littoral waters 49 Seaeye 49 Elmendorf AFB Alaska 49 Coast Guard icebreaker Healy 49 polar icebreaker 49 uncrewed 49 Inertial Navigation 49 MacArtney 49 IR C4I 49 SeeByte 49 HMS St Albans 49 cabled observatory 49 tactical unmanned aerial 49 KC #J tankers 49 airborne LiDAR 49 Anti Submarine Warfare ASW 49 Carrier Strike Groups 49 Drilling Program IODP 49 NSWC Dahlgren 49 Anti Submarine 49 HIAPER 49 underwater sonar 49 gradiometer 49 BAMS UAS 49 ROVs 49 Sikorsky HH 49 JHSV 49 Keyport Wash. 49 GeoStreamer 49 UGVs 49 Benthic Rover 49 Nihoa Island 49 antisubmarine warfare 49 UHD ™ 49 robotic submersibles 49 Ramform 49 Seaswarm 49 BomBot 49 Atmospheric Science RSMAS 49 Recon Optical 49 Air Cushion LCAC 49 Super Scorpio 49 MQ 8B 49 Aegis radar 49 research vessel Polarstern 49 ExoMars rover 49 TDRS K 49 HMCS Corner Brook 49 Vehicle UAV 49 sidescan 49 JS Kongo 49 UH 1N 49 HC #A 49 VTUAV 49 vehicles UGVs 49 Priz AS 49 Combat Vehicle 49 antisubmarine 49 TIM# 49 destroyers cruisers 49 CHIKYU 49 Navy MH #R 49 GLAST spacecraft 49 roundworms dominate 49 Trembanis 49 Navy frogmen 49 Discoverer Inspiration 49 Dynamic Positioning 49 KC #J 49 tactical UAV 49 Mine Countermeasure 49 Remote Operated 49 robotic submarines 49 Deep Siren 49 nautical charting 49 laser altimetry 49 RV Hispaniola 49 Aegis cruiser 49 ESA Envisat satellite 48 missiles torpedoes 48 SSGN 48 Semi Submersible 48 Landing Craft 48 robotic spacecraft 48 trimaran hull 48 HMAS Warramunga 48 Aegis warships 48 minisub 48 INS Shakti 48 NUWC 48 Airborne Laser Mine 48 Lockheed Martin LCS 48 HMCS Protecteur 48 Small Unmanned Ground 48 robotic probes 48 Waterjets 48 Landing VTOL 48 GeoStreamer ® 48 Alucia 48 Autosub# 48 Samuel Risley 48 ALMDS 48 Underwater Warfare 48 USS Kearsarge LHD 48 Remotely Operated Vehicles 48 closed circuit rebreathers 48 stealthy submarines 48 submersible robot 48 scan sonar 48 Vertical Takeoff 48 Sparrow Missile 48 INS Betwa 48 Navy MH #S 48 CH #F 48 missile destroyers 48 bathymetric survey 48 Explosive Ordinance Disposal EOD 48 MH #S helicopter 48 IRST 48 Pourquoi Pas 48 INS Shardul 48 Landing Tactical Unmanned 48 LEMV 48 HMAS Yarra 48 robotic submersible 48 FasTac Kit 48 Stena Forth 48 UH #J 48 Pulse Tidal 48 robotic rovers 48 Aegis BMD Weapon 48 USS Shoup 48 ScanEagle UAV 48 T AOE 48 Autonomous Underwater Vehicle 48 Unmanned Combat Air 48 VTOL UAV 48 electro optical EO 48 Block IIF 48 PHIBRON 48 ScanEagle unmanned aircraft 48 SCUBA divers 48 Relative Navigation 48 undersea warfare 48 Battlespace 48 FarSounder 48 HMS Myrtle 48 USS Essex LHD 48 hyperspectral imager 48 penetrating radar 48 F/A-#E/F aircraft 48 Seakeeper 48 SEAL Delivery 48 UW Applied Physics 48 ROV Remotely Operated Vehicle 48 USS McInerney FFG 48 USS Chung Hoon 48 BuckEye 48 SUAS 48 Mine Countermeasures Squadron 48 Viking landers 48 Aberdeen Oceanlab 48 P 8As 48 shipborne 48 UH #M aircraft 48 M1 Abrams Tank 48 Mars Pathfinder lander 48 USS McInerney 48 Navy minesweeper 48 Point Mugu Calif. 48 cruiser USS Chosin 47 Kay Kneen 47 Deep Submergence Facility 47 MH #S helicopters 47 Sikorsky CH #E 47 OPT PowerBuoy 47 Vessel ATV 47 Trident Warrior 47 Multispectral 47 M# howitzer 47 AWACS radar 47 Vehicle ROV 47 acoustic Doppler 47 TMT Shipping Offshore 47 HMS Terror 47 electro optical sensor 47 gyro stabilized 47 USS Chancellorsville 47 ROVs remotely operated 47 Fleet Anti Submarine 47 THEMIS spacecraft 47 Man Transportable Robotic 47 Forward Looking Infrared 47 cutter Munro 47 ENVISAT 47 amphibious warships USS Kearsarge 47 Australian Light Armoured 47 ship USNS 47 Packbot 47 ships USNS 47 Rolls Royce waterjets 47 USS Momsen 47 Anzac frigates 47 Technology JAMSTEC 47 Landsat satellites 47 electric ion propulsion 47 DP2 vessel 47 AMNS 47 subseafloor 47 EGBU 47 Uninhabited Aerial Vehicle 47 Raman spectrometer 47 Maritime Prepositioning Force 47 underwater archeologists 47 IFSAR 47 horsepower outboard engines 47 Aerial Vehicle 47 Hydrographic Survey 47 photonics mast 47 HMS Vigilant 47 HMCS Windsor 47 F/A-# jets 47 Submersible Voraxial 47 Aegis destroyers 47 Imaging Spectrometer 47 SWATH 47 DuraCOR 47 Sonardyne 47 Robotic Systems 47 rigid hull inflatable 47 Aegis Ballistic Missile Defense 47 Domain Awareness 47 Watchkeeper UAV 47 frigate HMCS Montreal 47 hydroacoustic 47 D5 missile 47 USS Benfold DDG 47 Global Positioning Satellites 47 Marine Corps Warfighting Laboratory 47 NextSat 47 unpiloted aircraft 47 Mine Countermeasures 47 RQ 7B Shadow 47 Air Combat Maneuvering 47 NFIRE 47 CFB Comox 47 wheeled armored vehicles 47 destroyer escorts 47 Littoral Combat Ship LCS 47 USS Silversides 47 Borei class 47 Airborne Surveillance 47 autonomous robots 47 EA #G aircraft 47 Submersibles 47 robotic explorer 47 vertical takeoffs 47 RTI middleware 47 FT IR spectrometer 47 Amphibious Assault Vehicles 47 THAAD radar 47 sunken trawler 47 HMCS Ottawa 47 OH #D 47 GPS IIF 47 JSTARS 47 drilling vessel Chikyu 47 Crittercam 47 Ronald Reagan Carrier Strike 47 JLENS 47 USS Thresher 47 INS Shivalik 47 USS Scorpion 47 orbiting telescopes 47 oceanographic 47 GOES satellites 47 Petty Officer Sondra 47 minehunter 47 Unmanned Aerial System 47 TALON robots 47 CAMCOPTER S 47 tidal turbine 47 passive sonar 47 VisionMaster FT 47 HMS Bulwark 47 WindSentinel 47 Martian rovers 47 USS Laboon 47 Coast Guard cutter Mackinaw 47 Kowalczk 47 Rivet Joint 47 submarine periscopes 47 Aerosonde Pty Ltd. 47 Vehicle SUGV 47 Nargeolet 47 seismic hydrographic 47 ship HMNZS Canterbury 47 THAAD interceptors 47 radar altimeters 47 microgravity experiments 47 NSWC Port Hueneme 47 USS Ingraham 47 Polair helicopter 47 Benthic 47 Fugro Geoteam 46 Submarine Launched 46 laser designator 46 grid V2G 46 Remotec 46 comet Boethin 46 AESA Radar 46 NetFires 46 HMCS Preserver 46 Aerosonde Mark 46 Laser JDAM 46 X ray spectrometer 46 Amphibious Assault Ship 46 Minas Passage 46 Marine Corps amphibious assault 46 Drillship 46 PackBot 46 robotic manipulators 46 Towed Pinger Locators 46 Unmanned Aircraft System 46 Submersible 46 maritime subsurface 46 Enterprise Carrier Strike 46 inshore patrol 46 optionally piloted 46 Predator unmanned aerial 46 Infrared Countermeasures 46 Digitalglobe 46 USS Elrod 46 Inmarsat FleetBroadband 46 NAS Whidbey Island 46 Jamaran destroyer 46 De Zeven Provincien 46 Skyray 46 hydrographic surveys 46 Saab Seaeye 46 Esquimalt BC 46 vehicles UAVs 46 JAMSTEC 46 Adept Quattro s# 46 Laysan Island 46 fleet replenishment oiler 46 Laboratory MBL 46 HMS Chatham 46 minelayer 46 vibroseis 46 X #A WaveRider 46 P 8A Poseidon 46 hyper spectral 46 SAS Isandlwana 46 Clearance Diving 46 Zumwalt destroyers 46 Hellcat fighter 46 airframe avionics 46 Multirole 46 MAVs 46 Nuytco 46 MC #J 46 Northern Ireland Strangford Lough 46 optionally manned 46 Observing System 46 Aegis Cruisers 46 Aqua satellite 46 hydrophones 46 Mars Analog Svalbard 46 HMNZS Canterbury 46 PowerBuoy 46 earth orbiting satellites 46 Moderate Resolution Imaging 46 deepest darkest abyss 46 Trident ballistic missile 46 exactEarth Ltd. 46 Squalus 46 Sikorsky HH #G 46 Navy EA #G 46 HULC 46 Marine Expeditionary 46 USS O'Kane 46 HMCS Victoria 46 orbiter Cassini 46 NFIRE satellite 46 Dana Yoerger 46 marinized 46 #,# ton Sazanami 46 Remotely Operated 46 penetrating electromagnetic 46 hypersonic jet 46 HMAS Leeuwin 46 USS Leyte 46 X #A Waverider 46 Tactical Engagement 46 Undersea Systems 46 EP 3E 46 HEL TD 46 EH# Merlin 46 EMAT 46 boat RHIB 46 watermakers 46 SubSea 46 P 8A 46 Elbit Systems Hermes 46 NIITEK 46 RDECOM 46 hyperspectral sensors 46 SH #F 46 submersible dives 46 Underwater Search 46 robotic landers 46 Scimitar armored reconnaissance 46 Electric Propulsion 46 defueling 46 Amphibious Ready Group 46 Kure Atoll 46 mooring buoy 46 Blueback 46 ATIRCM 46 Wild Weasels 46 HMCS Calgary 46 IFM GEOMAR 46 MARUM 46 SPOT HUG 46 CSIRO Wealth 46 Lotring 46 HH #H 46 lander rover 46 HURL 46 AC #H Spectre 46 FPSO FSO 46 HMS Turbulent 46 RG# MRAP 46 Scout Vertical Takeoff 46 Naval Undersea 46 gravity gradiometry 46 iRobot PackBot 46 Echoscope ® 46 CH #D helicopter 46 Targeting Forward Looking 46 RHIB 46 Bulava ballistic missiles 46 Firefinder 46 ICESCAPE 46 Ground Penetrating Radar 46 multimission helicopter 46 Star SAFIRE 46 Seawolf class 46 USS Flier 46 EDXRF 46 GeneSat 1 46 ESA Automated Transfer 46 Infrared Pathfinder Satellite 46 HMS Sceptre 46 precision guided munition 46 SBSS Block 46 multipurpose amphibious assault 46 EPOCh 46 E 8C 46 HyShot 46 Unmanned Aerial Vehicles UAVs 46 Vehicle ATV 46 GDLS C 45 USS Bataan LHD 45 Ground penetrating radar 45 Imaging Spectroradiometer 45 ESA Envisat 45 HERTI 45 amphibious assault 45 CCGS 45 pneumatic catapult 45 USS Bunker Hill 45 USS NIMITZ 45 Synthetic Aperture Radar SAR 45 Aerial Refueling Boom 45 microrobot 45 EADS Astrium GmbH 45 Aegis cruisers 45 Sineva missile 45 USS Cobia 45 multimission 45 Celebes Sea 45 Viper Strike 45 HMCS Fredericton 45 MEMS Inertial 45 SARBE 45 USNS Stockham 45 Littoral Combat Ship 45 CH #E 45 RQ 4N 45 Hovercraft 45 autonomous unmanned aerial 45 IVBSS 45 NASA rovers 45 JSOW C 45 Coast Guard USCG 45 Black Hawk Chinook 45 amphibious warfare ship 45 YM Uranus 45 Airforce Orion 45 TigerLynk 45 Sperry Marine 45 SBSS satellite 45 Sineva missiles 45 airborne LIDAR 45 Side Scan Sonar 45 Polarstern 45 Aegis Weapon Systems 45 navy destroyer 45 Anti Submarine Warfare 45 Faslane Scotland 45 USS Tarawa LHA 45 JSOW 45 vessel L' Astrolabe 45 Predator UAV 45 Chokai 45 Borei class nuclear 45 Unmanned Aerial Vehicles 45 USNavy 45 Mini Thermal Emission 45 Fugro Pelagos 45 J 2X rocket 45 Automotion Milstein 45 laser altimeter 45 USS Ticonderoga 45 Operation IceBridge 45 SANTA RITA Guam 45 USS Ramage 45 Evolved Sea 45 AP 3C Orion 45 Northrop Grumman Awarded Contract 45 submarine chasers 45 EA 6B 45 #th RQW 45 German battleship Tirpitz 45 Carrier Variant 45 INS Jyoti 45 UWATEC R 45 submarine periscope 45 Liberian flagged merchant 45 HMCS Algonquin 45 hypersonic glider 45 MQ 5B Hunter 45 Flight Landata 45 ton Nisshin Maru 45 GPS IIF satellites 45 rigid inflatable 45 electro optical sensors 45 Tactical Fighter 45 SPHERES 45 Civil War ironclad 45 unmanned reconnaissance 45 AH #D 45 Tactical Tomahawk 45 hyperspectral 45 highly maneuverable 45 Fugro GEOS 45 MSST 45 USS Arleigh Burke 45 missile frigate 45 vetronics 45 M#A# Bradley 45 radar altimeter 45 Combat Vehicles 45 BMC2 45 OSV BOLD 45 P 3C patrol 45 USS Lagarto 45 sonar evading 45 inflatable pontoons 45 polar explorer Roald Amundsen 45 electro optic sensors 45 USS Mitscher 45 gamma ray spectrometry 45 Remote sensing 45 Tornado F3 45 Oceanlab 45 EKV 45 Waquoit Bay 45 hydrophone 45 Ocean Observatories Initiative 45 unmanned robotic 45 JS Myoko 45 Reaper unmanned aerial 45 FPSO vessels 45 Task Force CTF 45 divers 45 Mitscher 45 Sniper XR 45 Hydrographer 45 Inertial Navigation System 45 minehunters 45 autonomous aerial refueling 45 Unmanned Ground Vehicles 45 AEGIS BMD 45 Hywind 45 Amphibious 45 DIRCM 45 MV Beluga SkySails 45 HMAS Toowoomba 45 A#T Hummingbird 45 JCTD 45 CH #K 45 CamCopter 45 Geosounder 45 radio occultation 45 Skyquest 45 ECPINS R 45 Interior Laboratory GRAIL 45 Navy P 3C 45 TALON robot 45 Griffon helicopter 45 Benthos 45 Patrol Vessel 45 SeaRay 45 CH #D 45 Hydroid LLC 45 INS Aditya 45 Kvichak 45 coastguard vessel 45 Fishfinder 45 amphibious assaults 45 SCUBA 45 lunar landers 45 dimensional seismic 45 USS Finback 45 NAWCAD 45 STUAS Tier II 45 missile corvette 45 scramjet engine 45 Samidare 45 SeaZone 45 Trauma Pod 45 Arleigh Burke Class 45 highly manoeuvrable 45 amphibious warship 45 SeaWiFS 45 battlecruiser 45 supply ship Weishanhu 45 supersonic combustion 45 VectorSeis 45 Nimitz Carrier Strike 45 Ambush Protected 45 HMAS Anzac 45 stealth warship 45 USS Wahoo 45 Naval Expeditionary 45 TerraGo Mobile 45 Technip deepwater pipelay 45 maritime interdiction operations 45 TCDL 45 GeckoOrient TM 45 Detection System ALMDS 45 carrier HMS Ark 45 MH #J 45 infantry brigade combat 45 ballistic missile submarine 45 LEDET 45 Astrobotic 45 HM Naval Base 45 Spearfish torpedoes 45 Seaking helicopter 45 Brimstone missiles 45 Cosmic Origins Spectrograph COS 45 destroyer squadron 45 tethered aerostat 45 submarines frigates 45 surface combatant 45 Submarine Escape 45 Envisat satellites 45 Charles Buffum brewery 45 Lt. Todd Vorenkamp 44 HyFly 44 Earth orbiting satellites 44 F/A-#C 44 Longbows 44 Lophelia II 44 Anglian Monarch 44 Propulsion Directorate 44 Synthetic Aperture Radar 44 MC #P 44 JAUS compliant 44 Eirik Raude 44 Tactical UAV 44 Ship Escort 44 ATFLIR 44 CH #D Sea Stallion 44 bathyscaph 44 HMAS Glenelg 44 infrared spectrometers 44 submersible robots 44 workboat 44 Geotab 44 recreational scuba divers 44 naval vessels 44 NAS Lemoore 44 Sonar Technician 44 AeroTEM II 44 EODMU 44 ELINT 44 Galileo spacecraft 44 pound GBU 44 Fanuc Robotics 44 UPLC MS 44 Laser Radar 44 Mir submersibles 44 pingers 44 Navy 44 #st MEU 44 USS Harpers Ferry 44 HMCS Charlottetown 44 Nautronix 44 USS Truxtun 44 M# howitzers 44 Rigid Inflatable Boat 44 LMRP containment cap 44 EOD robots 44 HH #C Dolphin 44 Intermediate Range Ballistic 44 airborne hyperspectral 44 Airborne Mine Countermeasures 44 mine sweepers 44 Mine Warfare 44 CH #E Sea Stallion 44 saturation diving 44 HMS Erebus 44 sQuba 44 Shirase 44 Unmanned aircraft 44 Fugro EarthData 44 TerraSAR X satellite 44 crewboats 44 Scorpenes 44 GDLS 44 RQ 4B Global 44 hovercraft 44 STORRM 44 AWACS airborne warning 44 Aerostats 44 HH #M 44 chartplotters 44 Minotaur rocket 44 Clipper Adventurer 44 Sagar Nidhi 44 Polar Operational 44 Atlas Elektronik 44 CodaOctopus 44 Polar Mist 44 UAVS 44 #nd MEU 44 AS# B3 44 landing VTOL 44 NAWCWD 44 EMEC 44 hydrothermal vent 44 Boeing P 8I 44 electro-optical/infrared 44 gyrocompass 44 Bisso Marine 44 AW# helicopter 44 midfrequency sonar 44 USS Tortuga 44 Operation Taconite 44 Nereus 44 Neumayer Station 44 shuttle Canadarm 44 CCMRF 44 Navatek Ltd. 44 RIMPAC exercise 44 RIMPAC exercises 44 EC# helicopter 44 Heron UAVs 44 ScanEagle unmanned aerial 44 EFVs 44 LITENING 44 NASA Lunar Reconnaissance 44 Geco 44 Raytheon IDS 44 amphibious warfare 44 MidSTAR 44 AV 8B 44 SUGV Early 44 Magnetometer 44 GoBook VR 2 44 Technology Demonstration JCTD 44 Naval Submarine Forces 44 Unmanned 44 USS Stethem 44 ReconRobotics 44 reachback 44 Sawfish 44 HL Hunley 44 USS Vicksburg 44 Evolved SeaSparrow Missile 44 unmanned subs 44 Odyssey Explorer 44 Littoral Combat 44 Jalashwa 44 HH #C 44 Quadski 44 Systems UAS 44 Auto GCAS 44 Gakkel Ridge 44 naval destroyers 44 LCVP 44 destroyer HMCS Athabaskan 44 submarines 44 Cloud Aerosol Lidar 44 cruiser USS Port 44 pipelayer 44 Technology Demonstrator 44 transportable platforms