You must be a US citizen, min age is usually 21 yrs old, have a vaild drivers license, have a 4 yr college degree or 3 yrs of experience, no felony convictions, willing to work anywhere in the US, pass a written entrance test, pass the overall interview, pass background investigations, pass a polygraph test, pass a psycological evaluation, pass a medical exam, pass a physical fitness test, vision must be correctable to 20/20.