before a soldier joins the army, he must qualify to be in it first. the person is put through tests, so that the army will know if the recruit can do it or not. this is sometimes called 'boot camp'. he must complete mental tests, and physical tests. it depends on where he is testing that will tell him how hard it will be. he will also take tests to determine what job he will do in the military. for instance, he may work with computers and be a member of the signal corps or be a cook for the soldiers, he may have been a construction worker in civilian life and be a military engineer, he may become a truck driver and serve in logistics, or he may be very good with a rifle and be a sniper in the infantry. there are a lot of jobs that a person can choose to do in the army.