Question: What is the main tank used by the US military?

List of currently active United States military land vehicles

The following is a list of currently active  United States military land vehicles grouped by type of land vehicle.
Main battle tank

M1 Abrams – 5,848 active use. Approx. 3,000 stored.
M1A1 SA/M1A1FEP
M1A2 SEP v2
Infantry fighting vehicles

Bradley Fighting Vehicle – 6,724[1]
M3A3 Bradley
M7 Bradley Fire Support Vehicle (B-FiST)
Bradley Engineer Squad Vehicle (ESV)
Bradley Battle Command Vehicle (BCV)
Armored personnel carriers

Stryker 4,466[2]
M1126 Infantry Carrier Vehicle (ICV)
M1296 "Dragoon" - All M1126 vehicles will be converted to this standard or attached with 4 Hellfire missiles.
M1127 Reconnaissance Vehicle (RV)
M1128 Mobile Gun System (MGS)
M1129 Mortar Carrier (MC)
M1130 Command Vehicle (CV)
M1131 Fire Support Vehicle (FSV)
M1132 Engineer Squad Vehicle (ESV)
M1133 Medical Evacuation Vehicle (MEV)
M1134 Anti-Tank Guided Missile Vehicle (ATGM)
M1135 Nuclear, Biological, Chemical, Reconnaissance Vehicle (NBC RV)
M113 armored personnel carrier – 6,000[3][4]
M58 Wolf
M113A3 APC
M113 Armored Medical Evacuation Vehicle (AMEV)
M548A3 Cargo Carrier
M577A3 Medical Vehicle
M901A3 Improved TOW Vehicle (ITV)
M1059A3 Lynx Smoke Generator Carrier (SGC)
M1064A3 Mortar Carrier
M1068A3 Standard Integrated Command Post System (SICPS) Carrier
LAV-25 – (light armored vehicle) 870[5]
LAV-25A2
LAV-AT (Anti-Tank)
LAV-M (Mortar)
LAV-R (Recovery)
LAV-C2 (Command & Control)
LAV-LOG (Logistics)
LAV-MEWSS (Mobile Electronic Warfare Support System)
Assault Amphibious Vehicle 1,311
AAVP-7A1 (Personnel)
AAVC-7A1 (Command)
AAVR-7A1 (Recovery)
Bison (armoured personnel carrier) 12
Pandur I 50
M93 Fox NBCRV – 123
Armored combat support vehicles
M1 Assault Breacher Vehicle – 39
M4 Command and Control Vehicle (C2V)
M9 Armored Combat Earthmover – 447
M60A1 AVLB
M88A2 Hercules
M104 Wolverine – 44
Mine-protected vehicles
RG-31 –
RG-33 – 1,735
Cougar – ~3,500 on order
International MaxxPro – 9,000
BAE Caiman – 2,800 on order
Oshkosh M-ATV – 8,700
Buffalo– 200
JERRV
Husky VMMD
Light armored vehicles

Humvee – ≈260,000[6][7]
M997A3 Ambulance[8]
M1097A2 Unarmored Cargo/Troop/Air-defense Carrier
M1114 Up-Armored Armament Carrier
M1116 Up-Armored Armament Carrier
M1145 Up-Armored Armament Carrier
M1151A1 Up-Armored Armament Carrier
M1152A1 Up-Armored Cargo/Troop Carrier
M1165A1 Up-Armored Command and Control Carrier
M1167A1 Up-Armored TOW Carrier
Ground Mobility Vehicle
General Dynamics Flyer
M1117 Armored Security Vehicle – 1,836
M1200 Armored Knight
Light utility vehicles

Desert Patrol Vehicle
Light Strike Vehicle
Advanced Light Strike Vehicle
Ranger Special Operations Vehicle
Interim Fast Attack Vehicle 157
Guardian Angel Air-Deployable Rescue Vehicle[9]
M1161 Light Strike. Vehicle (LSV)
M1163 Expeditionary Fire Support System (EFSS) Prime Mover
Grader
Wheel tractor-scraper
Backhoe
Caterpillar D7
John Deere 850J Medium Crawler Tractor (MCT)
Caterpillar D9
M816 Wrecker
MRZR-D (USMC)
Self-propelled artillery
M109A6 Paladin (155mm howitzer motor carriage; full-track) 850
M142 HIMARS 500
M270A1 MLRS 991
Anti-aircraft
M1097 Avenger – 1,000
Terminal High Altitude Area Defense – 24 interceptors
Prime movers and trucks
Medium Tactical Vehicle Replacement – 7,500
LARC-V
Heavy Equipment Transport System
M35 2½ ton cargo truck
M939 Truck – 32,000
M970
Family of Medium Tactical Vehicles – 80,000
Heavy Expanded Mobility Tactical Truck – 13,000
Logistics Vehicle System
Palletized Load System
Commercial Utility Cargo Vehicle
R-11 Refueler
Gun Truck
Miscellaneous
M-Gator
M973 (carrier, cargo) Small Unit Support Vehicle (SUSV)
M1065 (carrier, command post)
M1066 (carrier, ambulance)
M1067 (carrier, cargo) (flatbed)
M1030M1 Motorcycle
Forklift truck
Oshkosh Striker
Rhino Runner
Mamba APC
Wiesel 1 – 7
Ford F-Series
Chevy Tahoe
Unmanned combat vehicles
[10]
Dragon Runner
iRobot 510 Packbot
XM1216 Small Unmanned Ground Vehicle
iRobot 110 FirstLook[11]
iRobot 710 Warrior
Foster-Miller TALON
MARCbot IV
Remotec ANDROS
iRobot R-Gator
Squad Mission Support System (SMSS)
M160
Experimental vehicles
Ground Mobility Vehicle (proposed vehicle) (GMV)
Joint Light Tactical Vehicle (JLTV)
Amphibious Combat Vehicle (ACV)
Armored Multi-Purpose Vehicle (AMPV)
Modular Advanced Armed Robotic System (MAARS)
Black Knight (Unmanned Combat Vehicle) – prototype only
See also
Currently active military equipment by country
Vehicle registration plates of the United States Army in Germany
M-numbers
List of land vehicles of the U.S. Armed Forces
List of crew-served weapons of the U.S. Armed Forces
List of vehicles of the United States Marine Corps
List of weapons of the U.S. Marine Corps