Can U.S. Marines become Navy SEALs?

1. Only after they finish their enlistment in the Marines and reenlist in the Navy! 2. Marines cannot "sign up for army rangers"; they can potentially be selected to attend the US Army Ranger School, which is combat leadership course oriented towards small-unit tactics.

No, you have to be in the Navy to become a SEAL. Marines may go through Army Ranger school but they do not become Rangers. They are still Marines.

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