was that school in the DC area...I had an USAF buddy that went to a USN diving school in the late sixties...I want to say 67 or 68...
The school I attended was located in Subic Bay, PI. During the SCUBA portion of the class we had 14 RECON Marines in the class with us. 2 Officers and 12 enlisted Marines. They returned to Vietnam after they graduated from SCUBA training.