['be an active-duty member of the U.S. Navy.', "be a man (women aren't allowed to be Navy SEALs)", 'be 28 or younger (although waivers for 29- and 30-year-olds are possible)', 'have good vision -- at least 20/40 in one eye and 20/70 in the other (corrective surgery is also possible)', 'be a U.S. citizen.']