Can women become Marine Snipers

No, its a biological fact that females do not have as much physical strength as males. Its called testosterone, it keeps females from competing with men, and until females can compete with men (aka never), they cannot be put into combat arms.

^-- They only can't do this because it's a rule to military. Some of the best snipers in history are females, they can do just as good as a man despite biological differences.