United Aircraft of Canada T-400 Twin PAC engines
U.S. Department of the Navy
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/imgsrv/download/pdf?id=mdp.39015076084048;orient=0;size=100;seq=299;num=4769;attachment=0">Fiscal year 1976 and July-September 1976 transition period authorization for military procurement</a>, Statement of Lt. Col. A. H. Bloom, U.S. Marine Corps, AH-1J Project Manager, Naval Air System Command, pt. 9, p. 4769