There is no such thing as an OTC prohormone. PHs were outlawed a couple years ago, so anything, or anyone claiming to sell PH OTC, well, look real close at the ingredients. I dont know of anything you can take OTC that would require a PCT. And if there was, it is probably a waste of $$.
Ethyl esterfied creatine is as close as you are going to get for noticable gains in strength and size without use of pct, and there are other products out these days that will give you the gains you desire without pct, alot of which are promoted on this site. This is the only board that has sponsors who actually tell you exactly what you are getting for your money, and the products are of great quality. Primordial performance has some great products and also info on how to use them in conjunction with other products for optimal gains.
Good luck in bootcamp bro. Which branch of service?