Rifle she's holding is a late-production AEK-971 (or -972 if it's chambered in 5.56mm), the hand grenade is an M26/M61 variant, and the battleship is USS Missouri (BB-63). No idea about the submarine - always been terrible with those, but I'd hazard a guess that it dates to the late WWII or early Cold War era, given the lack of either a teardrop hull or deck gun.

Fuck logic! This is MAGIC! Where submarines can surface from the ground!
Man that made my day. This character looks very Madoka inspired?