Originally Posted by sinjefe

Around, yes. Allowed to come straight in, no. From about 1985 until Dec 2001, you had to be at least an E-5 in the Regular Army, though they would waiver that to an E-4 (P) for Medics and Commo guys. In Dec 2001, they opened it up to 18Xs

http://www.training.sfahq.com/qualifications.htm