Game: Battlefield Vietnam
Map: Fall of Lang Vei
Weapon: CAR-15 rifle with XM148 grenade launcher
Shoot!
Game: Counter-Strike: Source
Map: cs_militia
Weapon: AK-47
Steal weapon from terrorists and shoot.
Game: probably Battlefield 2
Map: probably Dragon Valley
Weapon: probably FGM-172A SRAW rocket launcher
Game: Call of Duty 2
Map: Carentan
Weapon: Kar98