Well, I think 3 is better than 2, but... (italics means 3rd if you accept my 3 idea)
-Germany-
Tiger Tank (Tank), MG42 (Machine Gun), Messerschmitt (Fighter)
-Korea-
Hwacha (Catapult), Hwarang (Archer), Turtle Ship (Galley)
-France-
Musketeer (Musketman), Chevalier (Cuirassier), Howitzer...