Military Services

why cant all branches of Military train the same way?

About Me

Hello my name is Tyler Arnold, I am 15 years old and love to help people. why can't the US Army/Marines/Navy Seals work at the same rate of training? I chose this question because i'm interested in what the Military does. you should be interested in this question because there might be in another World War and will need more people to fight in that war.