P90 due to its short length, maybe Steyr AUG A2 with a 14" barrel if you want ammo commonality with everyone else.
By the way, what is the current armament for US tank crews? My friend is shipping off to train to be part of an Army Abrams crew, and he says they get M4s or M240s.
Whatever you choose it should share common spares with other weapons issued within that force. Nothing is much use unless you have access to spares where ever you go.
L22A2 carbine, as issued to Royal Armoured Corps tank crews in Iraq; note that it has a Picatinny rail above the front grip
Caliber: 5.56x45 NATO
Action: Gas operated, rotating bolt
Overall length: 780 mm (709 mm in Carbine variant)
Barrel length: 518 mm (442 mm in Carbine variant)
Weight: 4.13 kg (with SUSAT optical sight and no magazine); 5 kg with SUSAT and loaded with magazine with 30 rounds of ammunition
Magazine capacity: 30 rounds
Rate of fire: 650 rounds per minute
Effective range: about 500 meters (with SUSAT sights)
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