US ground forces 2021 (IISS), Tanks and artillery. Even the US doesn't have that much compared to Russia. Air force is a different story, the US is far superior here. No wonder Ukraine is not getting the 3000-2000 artillery pieces it needs. The US, the most funded military in the world, only has some 4,300 heavy artillery pieces itself...
US Army and Army Reserve:
ARMOURED FIGHTING VEHICLES MBT 2,509: 750 M1A1 SA Abrams; 1,605 M1A2 SEPv2 Abrams; 154 M1A2C Abrams; (ε3,700 more M1A1/A2 Abrams in store)
ARTILLERY 5,469 SP 155mm 1,023: 900 M109A6; 123 M109A7 (ε500 more M109A6 in store) TOWED 1,339: 105mm 821 M119A2/3; 155mm 518 M777A2 MRL 227mm 600: 375 M142 HIMARS; 225 M270A1 MLRS MOR 2,507: 81mm 990 M252; 120mm 1,076 M120/ M1064A3; SP 120mm 441 M1129 Stryker MC
US Marine Corps:
ARTILLERY 1,452 TOWED 812: 105mm: 331 M101A1; 155mm 481 M777A2 MRL 227mm 40 M142 HIMARS MOR 600: 81mm 535 M252; SP 81mm 65 LAV-M; 120mm (49 EFSS in store for trg)