Related by context. All words. (Click for frequent words.) 62 EA #G aircraft 61 Eurocopter AS#B# 61 EC# helicopters 61 P 8As 61 UH 1N 61 KC #J tankers 60 MH #R helicopters 60 AH #D 59 F/A-#E/F aircraft 59 C #J aircraft 59 MH #S helicopter 59 MH #S 59 AH 1Z 59 UH 1Y 59 STOVL aircraft 58 UH #L 58 replaceable assemblies 58 NH# TTH 58 BLACK HAWK helicopters 58 multimission helicopter 58 Sikorsky UH 58 Dhruv helicopters 58 AW# helicopters 58 KC #J Hercules 58 NH#s 58 NH# helicopters 57 Cormorant helicopters 57 P 3C Orions 57 AS#N 57 Eurocopter EC# helicopters 57 HH #M 57 MH #R 57 Su #MK# 57 MH #R aircraft 57 Aegis warships 57 KDX III 57 Air Cushion LCAC 57 Sukhoi fighter planes 57 Navy MH #S 57 Navy MH #R 57 KC #J 57 MC #J 57 UH 1H 57 UH 1Y Huey 57 AS#B# 57 P 3Cs 57 AH 1W 57 EC# helicopter 56 AIM 9X Sidewinder 56 P 3C maritime 56 Sikorsky S# helicopters 56 AgustaWestland AW# helicopters 56 AW# helicopter 56 Sniper pods 56 amphibious warfare ship 56 AWACS radar 56 AW#s 56 Sikorsky MH 56 Laser Guided Bombs 56 Sikorsky UH #M 56 AN/TPS-# 56 CC #J 55 missiles torpedoes 55 Heron unmanned aerial 55 Sikorsky Black Hawk 55 Dhruvs 55 MQ 8B 55 GE CF# 55 S #B Seahawk 55 C #Js [001] 55 C #H Hercules 55 Harpoon missiles 55 JT9D 55 F 5E 55 shipborne 55 Bombardier #MP 55 AH #A 55 Rolls Royce Turbomeca 55 EC#s 55 HC #J 55 Bell #EP 55 HH #L 55 Aegis Weapon Systems 55 #L# [002] 55 AEGIS destroyers 55 Turbomeca engines 55 CH #D Chinook helicopters 55 P 3C aircraft 55 Mig #s 55 Eurocopters 54 MH #G 54 AS# NP 54 HH #H 54 Globemaster III aircraft 54 AIM #C 54 ALHs 54 APS #C 54 Vertical Launching System 54 MH #J 54 TOFTs 54 CH #F Chinook 54 sonobuoys 54 M#/M# Bradley 54 Boeing AH #D 54 UH #J 54 UH #M 54 Su #MKI fighters 54 helos 54 HH #C 54 GATM 54 C#J 54 CH #D 54 mine countermeasure 54 submarines frigates 54 OH #D 54 MH #E 54 Griffon helicopters 54 AN/PRC-# C radios 54 F #Bs 54 Heron UAV 54 F/A-#C 54 AV 8B 54 UH #L Black Hawk 54 EH# Merlin 54 Phalanx Close 53 SPY 1F 53 RQ 4B Global 53 IMD HUMS 53 LTS# 53 Aegis BMD capability 53 Sikorsky CH #E 53 missile frigates 53 AW# medium 53 multipurpose amphibious assault 53 Navy F/A-#s 53 LAV A2 53 LCACs 53 Su #MKIs 53 Aegis radar 53 Eurocopter helicopters 53 TruLink 53 P3C Orion 53 UH 1H Huey 53 Gyroplane 53 MH #R helicopter 53 General Electric CF6 53 C #H 53 Garmin G# integrated 53 A#E 53 midget submarines 53 UH 1H helicopters 53 Carrier Variant 53 Scorpenes 53 UH #M Black Hawk 53 laser designators 53 Adour engines 53 SATCOM terminals 53 Eurocopter EC# helicopter 53 Amphibious Assault Ship 53 CH #E Sea Stallion 53 AN/AQS-#A 53 electro optical sensor 53 LEAP X1C 53 Huey helicopters 53 RQ 4A Global 53 BrahMos missiles 53 SH #B Seahawk 52 GNS #W/#W series 52 Ka #T 52 AIM #D 52 MH #S Knighthawk 52 Pave Hawk 52 EH# helicopters 52 Boeing #NG aircraft 52 C 5Ms 52 Dornier aircraft 52 Paveway II 52 LAIRCM 52 missile destroyers 52 fleet replenishment oiler 52 Puma helicopters 52 MRTTs 52 AESA radars 52 amphibious warship 52 RG# MRAP 52 UH #M BLACK HAWK 52 stealth frigate 52 M9 pistols 52 M# howitzer 52 C #E Hercules 52 Aircrew Training System 52 Hawklink 52 Tactical Tomahawk 52 AH 1W Cobra 52 Gulfstream G# G# G# 52 Mi #T 52 Heron UAVs 52 Su #MKI aircraft 52 EOD robots 52 Anzac frigates 52 Eurocopter EC#s 52 AW#Ke 52 SatMAX R 52 EA 6B 52 electro-optical/infrared sensor 52 Osprey tiltrotor aircraft 52 AN/AAQ-# 52 array AESA radar 52 amphibious warships USS Kearsarge 52 Dorniers 52 Super Etendard 52 turboshaft engines 52 Litening 52 vehicles UAVs 52 P 3C patrol 52 C #J Super 52 P 3C 52 Advanced Cruise Missiles 52 Falcon III AN/VRC-# 52 SH #B 52 Bullets pinged 52 Rigid Inflatable Boats 52 1Gig PowerBook G3 52 Device FTD 52 P 8I aircraft 52 AWACS aircraft 52 ATR# [001] 52 VisionMaster FT 52 THAAD missile 52 AN/VRC-# 52 FFSs 52 SaM# engine 52 Alouette III 52 Marine Corps KC #J 52 Liferafts 52 Erieye 52 F 4s 52 helicopter airframes 52 Full Flight Simulators 52 CH #D Chinooks 52 KC #J tanker 52 Steyr rifles 51 MRH# 51 BQM #E 51 Su #SM 51 Eurocopter EC 51 Nuri helicopters 51 MiG #Ks 51 Jalashwa 51 Common Sensor Payload 51 Globemaster III airlifter 51 Shadow Tactical Unmanned 51 CH #Es 51 Rigid Hull 51 CFM# engines 51 UH# Black Hawk 51 Littoral Combat Ships LCS 51 SH #F 51 IntuVue 51 Personal Locator Beacons 51 ATR #-# turboprop aircraft 51 Littoral combat 51 Joint Helmet Mounted 51 Anti Submarine 51 AH #D Apache 51 Su #MK 51 Marine AV 8B 51 KC #Js 51 IFVs 51 tandem rotor 51 CROWS II 51 Seaking helicopter 51 Air Force RMAF 51 MiG #K fighter jets 51 M-TADS/PNVS 51 shipsets 51 F/A-# fighter jets 51 Sikorsky Aircraft Corporation 51 AS#L# 51 RTG cranes 51 survivability enhancements 51 Submarine Launched 51 AV 8B Harriers 51 TACAN 51 Navy P 3C 51 EH# [001] 51 SUAV 51 Black Hawk Chinook 51 AN/PVS-# 51 BK# [003] 51 P 8A Poseidon 51 nozzles hoses 51 STC'd 51 CH #K heavy 51 INS Aditya 51 defueling 51 Constitution Frigate 51 Agusta Bell 51 MQ 1C 51 AW# Power 51 Marine Corps CH #E 51 Neuera ™ 51 AESA Radar 51 Reaper UAVs 51 Sky MAXX 51 INS Betwa 51 AN/TPQ-# 51 MRAP Vehicles 51 Sikorsky HH #G 51 Kamov helicopters 51 Vehicle Mounted 51 Anti Submarine Warfare ASW 51 turboshaft 51 Bell UH 1H 51 JDAM kits 51 Aegis Combat 51 AN/FPS-# 51 Honeywell TFE# 51 Tech Insertion 51 AS #B# 51 BO# 51 tactical airlifters 51 CH #E 51 Yellow confetti rained 51 B# #ER aircraft 51 Integrated Cockpit 51 MV Prantalay 51 unpressurized cargo 51 AC #H 51 Aegis cruisers 51 Boeing #NG 51 JERRV 51 electro-optical/infrared 51 MH #R Seahawk 51 CH #K 51 PT6A 51 laser illuminator 51 avionic upgrades 51 Su #MKM 51 AgustaWestland AW# 51 quay cranes 51 enhanced Paveway II 51 Eurocopter EC# 51 stealth frigates 51 roll-on/roll-off ships 51 Base Comox 51 UH 1N Huey 51 Chetak helicopters 51 Sikorksy 50 Turbo Mallard 50 aircraft Gaenicke 50 Falcon #LX [001] 50 Aegis destroyers 50 INS Shakti 50 Diamond DA# 50 Navy destroyers 50 any ABthrax doses 50 SAS Spioenkop 50 ITES 2H 50 CTOL 50 Sniper XR 50 Sukhoi jets 50 RQ 7B Shadow 50 USS Harpers Ferry 50 PW#G engines 50 #MK 50 repel Somali pirate 50 IL #TD 50 UH #As 50 Sikorsky S# 50 JS Kongo 50 AH #Ds 50 ships USNS 50 marine gasoil MGO 50 Eurocopter Dauphin 50 Lauriot Prévost VPLP 50 F #Ks 50 AH #D Apache Longbow 50 industrially hardened 50 BrahMos cruise missiles 50 Navy Seahawk helicopters 50 Gripens 50 superfreighter 50 USVs 50 Tu #MS bombers 50 Navy F/A-#E/F 50 Voith Schneider 50 MV Nimalawa 50 FPSO hull 50 Tornado GR4s 50 Rivet Joint 50 Modular Airborne 50 MKI fighter aircraft 50 OPVs 50 EC# B4 50 AN/APG-# 50 multirole fighters 50 AW# Ke 50 GE# engines 50 Chinook helicopters 50 Thermal Imager 50 Erieye radar 50 wheeled armored vehicles 50 BLACK HAWK helicopter 50 aircraft antiskid braking 50 Air Launched Decoy 50 semi submersible vessel 50 avionic systems 50 Air Combat Maneuvering 50 electro optic infrared 50 MiG #K fighters 50 MRAP variants 50 #rd Maintenance Squadron 50 P3 Orion 50 Active Electronically Scanned Array 50 PT6A engines 50 Borei class nuclear 50 Su #MK# fighters 50 stealth destroyers 50 navy frigates 50 polar icebreaker 50 Globemasters 50 T AKE ships 50 M#A# Abrams Main 50 aircraft 50 Kiowa Warrior 50 Medevac helicopters 50 M# launcher 50 Navy EA #G 50 towed howitzers 50 AP 3C Orion 50 CH #D Chinook 50 pusher propeller 50 airframe parachute 50 Airbus A#XWB aircraft 50 multirole aircraft 50 CAC2S 50 Laser Guided Bomb 50 RHIBs 50 MA#s 50 Aerial Vehicle 50 Hawker #XPs 50 JHSVs 50 Cougar Mastiff 50 HAL Dhruv 50 C 5Bs 50 M#A# Abrams Tank 50 MC #E 50 Akash missiles 50 amphibious warships 50 Hercules airlifters 50 EASy 50 Avidyne Entegra 50 F #As [001] 50 CH #Fs 50 Intelligence C4I 50 twinjets 50 First InterComm 50 G# equipped 50 Spanish shipbuilder Navantia 50 Tor M1 surface 50 Evolved Sea 50 Giancana furniture 50 ship USS Bataan 50 Super Stallion 50 FADEC equipped 50 Unmanned drone 49 OH #D Kiowa Warrior 49 MD #N 49 medevac helicopters 49 cockpit avionics 49 Turbomeca Arriel 49 Eurocopter AS# 49 Chinook CH 49 Assault Amphibious Vehicle 49 MiG #K naval 49 E/A-#G aircraft 49 MKI aircraft 49 Trident ballistic missile 49 STOVL variant 49 Carbon Monoxide detector 49 System ARBS 49 Extended Range ER 49 F/A-#E/F 49 AgustaWestland helicopters 49 helicopters 49 www.cessna.com 49 UH 1D 49 Avenger torpedo bombers 49 EuroHawk 49 Shenyang Aircraft Corp. 49 Helmet Mounted Display 49 UHF radios 49 electro optic sensors 49 amphibious assault ships 49 F #Ds 49 cockpit wiring harnesses 49 S #CBi 49 Phalanx Block 1B 49 AS# B2 49 aircrafts 49 Knighthawk helicopter 49 TCAS II 49 missile frigate 49 minehunter 49 Glass Cockpit 49 marinized 49 AH 1Z Cobra 49 Full Flight Simulator 49 Sukhoi Su #MKI 49 ATR# #s 49 Navy SH #B 49 AESA radar 49 turboshaft engine 49 EchoStorm Worldwide 49 Phalcon AWACS 49 Air Missile AMRAAM 49 Small Diameter Bombs 49 VTUAV 49 Boeing Dreamlifter 49 passenger VTOL 49 Rapid Aerostat Initial 49 Mi 8T 49 Mil Mi 49 ACJs 49 Zumwalt destroyers 49 MiG #K 49 2 Block IIIA 49 Koreasat 6 49 helmets flak vests 49 Neuera 49 Remotely piloted 49 NVG compatible 49 MiG #KUB 49 shunter locomotives 49 Sukhoi SU 49 Garmin GNS 49 optionally manned 49 supersonic cruise missile 49 Mi #N 49 SSGNs 49 C# Hercules 49 turbojet engines 49 OHSAS # certified 49 ESAPI plates 49 Swedish Gripen 49 aicraft 49 turbine generator sets 49 Samidare 49 Firefinder 49 troop transporter 49 Navy RMN 49 RNLAF 49 AW# [001] 49 UH 1s 49 CH #D helicopter 49 G#s [001] 49 PAE T6 49 shipset 49 SuperCobra 49 UH 1N aircraft 49 S #PMU 49 Arleigh Burke DDG 49 C #Js [002] 49 ATR #-# aircraft 49 Modular Lightweight Load 49 Seaeye 49 RF 4C 49 CH #F Chinook helicopters 49 CFM# 7B engines 49 JS Myoko 49 AN/ALQ-# 49 B 1B Lancer 49 Anchor Handling Tug 49 Aegis Cruisers 49 Unmanned Aerial Vehicles UAVs 49 LHDs 49 Tactical Trainer 49 precision guided munition 49 F/A-# Hornet aircraft 49 Pavehawk 49 E 2C 49 naval frigates 49 F/A-# jets 49 contacting MedPredict 49 Falcon III AN/PRC-#G 49 era UH 1H 49 RQ 4 49 F 4E 49 UH# [002] 49 F/A-#C/D 49 medical evacuation MEDEVAC 49 Urgent Operational Requirement 49 M#A# rifles 49 Sineva missiles 49 Anti Surface Warfare 49 Pave Hawks 49 #Bs [002] 49 Falcon III AN/PRC-# 49 TOR M1 49 architects Van Peteghem 49 supersonic fighter jets 49 Hercules transports 49 Combat Vehicle 49 ramjet propulsion 49 B# NG 49 E/A-#G 49 P3C Orion maritime 49 PW# engines [002] 49 U 2S 49 Kamov Ka 49 Arleigh Burke Class 49 uncrewed 49 EGBU 49 X#C 49 gunboat Panay 49 MQ 8B Fire 49 Mi# [002] 49 sterilizers environmental 49 Bombardier Dash #-# 49 Agusta A# 49 C2PC 49 TEU container vessels 49 destroyers cruisers 49 ADSI CPKs 49 UH 1N Hueys 49 terrain forklifts 49 airborne reconnaissance 49 GE CF6 engines 48 AIM #C# 48 pumpout boats 48 Citation CJ1 + 48 antitank weapons 48 AV 8B Harrier 48 sensor payloads 48 CF6 #C# 48 electromechanical assemblies 48 Capstone MicroTurbine R 48 multifunction displays 48 amplifier adapter 48 submarines homeported 48 SAS Isandlwana 48 Knighthawk helicopters armed 48 NH# NFH 48 strategic airlifter 48 LRAD #X [001] 48 HTAWS 48 Thunderbolt IIs 48 RTM# 48 #Ms [001] 48 Chelton EFIS 48 destroyers submarines 48 Aegis Destroyer 48 Technip deepwater pipelay 48 AC #Us 48 CC #J Hercules 48 High Mobility Multipurpose 48 tiltrotor aircraft 48 USS Cobia 48 littoral combat ships 48 Remotely operated 48 civilian mariners 48 Super Tucano aircraft 48 Cueing Systems 48 Predator UAV 48 UH #M Upgrade 48 Lancair ES 48 Cheetah helicopters 48 #EX [002] 48 IAE V# engines 48 AS# B3 48 mHawk engine 48 Navy P 8A 48 St Calixte Que 48 Littoral Combat 48 Capstone MicroTurbine ® 48 Airborne Warning 48 pilot ejects 48 FREMM frigates 48 LRAD RX 48 emergency locator transmitters 48 P3C Orion aircraft 48 Falcon #EX [003] 48 gyrocompass 48 aerial resupply 48 Borei class submarines 48 HEMTT A4 48 GE# engine 48 AH 1W Super 48 Panavia Tornado 48 Dhruv Advanced 48 #SP [002] 48 supersonic cruise missiles 48 P3C 48 BlueCore4 remains 48 F/A-#F Super Hornets 48 Insas rifles 48 USS Ramage 48 minehunting 48 MH #S mine 48 Airborne Surveillance 48 Cessna Citation Sovereign 48 MARCH FIELD AIR MUSEUM 48 Raptor stealth 48 amphibious ships 48 Indigenously 48 Sensis MDS 48 Aviation Combined Arms 48 Globemaster IIIs 48 USS Mustin 48 A# #F freighters 48 AreaRAE Responder 48 TADS PNVS 48 Marine Corps amphibious assault 48 Helicopter Mine Countermeasures 48 ASDE 48 AN/PRC-# 48 HITRON 48 C #Hs 48 GE CF6 48 GLAST spacecraft 48 Electronic Portable ADEPT 48 reliability maintainability 48 #-# Dreamliner 48 RSAF 48 Eurofighter Typhoon aircraft 48 appliqué armor 48 USS Antietam 48 FANUC robots 48 oceanographic vessel 48 #CBi 48 ship HMAS Manoora 48 ro ro vessels 48 #mm Bushmaster 48 SatMAX ® 48 CH #E helicopters 48 MH #S Seahawk 48 Cargo Aircraft 48 EADS Astrium GmbH 48 Mig #K 48 Apache Longbow 48 PlaneView 48 CH #Ds 48 Aegis Weapon System 48 Globemaster III transport 48 F #Is 48 F/A-# Hornet fighter 48 unmanned airborne 48 Canadair Regional Jets 48 USS Chung Hoon 48 Lockheed C #J 48 Multirole 48 Rockwell Collins Pro 48 tactical reconnaissance 48 TALON robots 48 UHF SATCOM 48 multirole 48 HMCS Corner Brook 48 Sukhoi #MKI 48 midair refueling 48 e3 Fuel Saver 48 P 8i 48 wheeled armored 48 F #I fighter jets 48 Ecureuil 48 HMCS Preserver 48 KC #A [001] 48 KD Sri 48 Hercules C# 48 twin rotor CH 48 Sidewinder missiles 48 L#B 48 CF# engines 48 USS Preble DDG 48 Air Force HH #G 48 Osprey tiltrotor 48 Project Wedgetail 48 unmanned reconnaissance drones 48 À# 48 Harrier GR9 48 Sineva 48 F# Joint Strike 48 fighter aircrafts 48 B#NG 48 Cessna #s 48 BACN 48 Scorpene submarines 48 Kiran Mk II 48 EC# EC# 48 Rolls Royce Trent XWB 48 CH #F 48 Airbus A# #F 48 EA #Gs 48 #,#-#,# lb 48 Multi Sensor 48 T #TS 48 submarine frigate 48 battle tanks MBTs 48 NH# helicopter 48 Light Armored Vehicles 48 times Bonnie Canner 48 V STOL 48 telephoned Salam Fayyad 48 Helibras 48 DuraCOR 48 JTAG port 48 intratheater airlift 48 Sukhois 48 Frame 9FA gas 48 AV 8B Harrier jets 48 SATCOM WGS 48 AIM 9X 48 Aegis cruiser 48 F/A-#F 48 Sniper pod 48 flew reconnaissance missions 48 MTU #V 48 minehunters 48 Infantry Fighting Vehicle 48 hovercrafts 48 System GMLRS 48 turboprop airplanes 48 G ATOR 48 AWOS 47 Kfir jets 47 AGM #R 47 REMUS 47 mm grenade launcher 47 A# Koala 47 Bombardier Q#s 47 ballistic shields 47 UH #M aircraft 47 La Foudre 47 Global Helicopters Sikorsky 47 Mirage jets 47 Cessna Citation CJ3 47 Piaggio Avanti 47 Joint Standoff Weapon 47 EH# helicopter 47 USNS Kanawha 47 Illyushin 47 MiG #K fighter 47 #-# Intercontinental passenger 47 refrigeration valves 47 RQ 4A 47 heat shrinkable tubing 47 aerostats 47 RNZN 47 HC #P 47 maritime reconnaissance 47 Accounts Receivable Financing Receivable 47 STANAG 47 TOW missile 47 Oryx helicopters 47 #S tanks 47 2D Hawkeye 47 CAE Simfinity 47 F 5E jets 47 ANZAC frigates 47 ECPINS ® 47 #ER Freighters 47 CFM# 5B engines 47 antisubmarine aircraft 47 Citation CJ2 + 47 Patriot antimissile 47 #th RQW 47 Utility Helicopters 47 #st Fighter Squadron [001] 47 Coral shredded 47 Sukhoi fighters 47 manpack 47 manufactured indigenously 47 antimissile systems 47 JSECST 47 HH #G 47 allied navies 47 M# howitzers 47 radar evading stealth 47 inertial navigation system 47 System RIPS 47 E #mm f/#.#L 47 Citation CJ2 47 ERJ #s 47 engine turbo prop 47 Light Helicopter Dhruv 47 Mistral class 47 LZ# [002] 47 JCREW 47 Agusta SpA 47 palletized load 47 M# Howitzer 47 ELINT 47 cutter suction dredgers 47 Airborne Mine Countermeasures 47 SSGN 47 reconnaissance planes 47 Legend Cub 47 Mk5E 47 UCAVs 47 Gripen fighter aircraft 47 Apache AH 47 AC #U 47 AIM 9L 47 Lightweight Laser Designator 47 Engineering Works KSEW 47 Landing Craft 47 #Ms [002] 47 Terrain Awareness 47 JTRS approved 47 microwave ovens refrigerators 47 SU #MKI 47 rotables 47 GP# powered A#s 47 #VS 47 ® AN/PRC-# C 47 NLOS C 47 selects Rockwell Collins 47 Cessna Citation XLS 47 Hydroid 47 KC #R 47 DMUs 47 TBMs 47 polar icebreakers 47 Lightning IIs 47 turbo propeller 47 LHTEC 47 IED jammers 47 GNSS Receiver 47 Sea Skua 47 IRST 47 MQ 1B 47 Vestas V# [001] 47 LITENING 47 NI Labview 47 Saraya Aviation 47 Pilatus PC# 47 CJ2 + 47 F #P frigates 47 Sukhoi jet 47 Combat Readiness Center 47 GammaRAE II 47 artillery helicopter gunships 47 CH# Chinook 47 Eurocopter BK# 47 Su #SK 47 Fly bys 47 AH #D Longbow 47 JT#D 47 FPSO vessels 47 Super Scorpios 47 CF6 engines 47 Thermal Imagers 47 Kongsberg Defence & 47 Liberian flagged merchant 47 EP 3E 47 crawler dozers 47 HMAS Glenelg 47 GR9 47 underwing hose 47 antiaircraft missile 47 LED streetlight fixtures 47 Enstrom #B 47 Navman marine 47 HMCS Windsor 47 AuraGen VIPER 47 C#s [002] 47 Landing VTOL 47 Seahawk helicopters 47 Topol M ICBM 47 BLACK HAWK 47 gendarme helicopter 47 DIRCM 47 AC #H Spectre 47 Laser JDAM 47 minesweeping 47 MC #W [001] 47 EMAT 47 WESCAM 47 Tilt Rotor 47 DRS Fermont 47 Dhruv helicopter 47 Mk# [002] 47 unmanned underwater 47 F/A-# F 47 EA 6B Prowlers 47 submarine periscopes 47 MiG #N 47 THAAD radar 47 Elmendorf AFB Alaska 47 Sovremenny class destroyers 47 MH #S Sierra 47 Jet Trainers 47 #ER jetliners 47 TPMS sensors 47 Unmanned Aerial Vehicles 47 locating radars 47 Growler electronic 47 avionics 47 precast concrete slabs