CHARLES COPELAND MAGAZINES
According to the excellent reference source DEVINE'S GUIDE TO MEN'S ADVENTURE MAGAZINES by Bill Devine (where I first learned a lot of the info passed on here), ACTION LIFE changed its name to COMPLETE MAN in 1965, and indeed ACTION LIFE ends with Vol. 4 and COMPLETE MAN starts with Vol. 5, No. 1. ACTION LIFE did a lot of reprints from earlier Diamond Group magazines. They were published by Atlas Magazines, one of the many faces of Magazine Management.