Do u have 2 be 17 and have a high school graduation to join the army?

i have a realy stupid freind who thinks he can just drop out at 16 and join the marines and that hes gonna go to texas and be a border patrolman. i have no clue why he thinks the marines are the border patrol. he also thinks that he wont need a education if he joins because all u need to kow in life is how to live of the land