A background check, A physical test, An ASVAB test, A Drug Test. If you can pass all that you will be good to go. Not too hard they will try to get you to signup for a rate that needs people, don't settle for this at all.
J'ai postulé en personne. J'ai passé un entretien chez US Navy (San Diego, CA) en oct. 2013
Entretien
Just go to a recruiting office its easy. You will fill out some paperwork and take an easy general education test. Then you will pick a job and go out for a physical.
