I looked up my 1967
AIRBORNE CLASSBOOK, CLASS 33...42ND & 46TH COMPANIES, FORT BENNING, GEORGIA this evening. Sure enough, I found the Darling Quick Release system prominently shown in the photos from our class's Jump School. Here they are:
This shows a student jumper doing a training jump off a short platform.
This is a closeup of the jumper, showing better (if my scan turned out okay) the Darling Quick Release. We were jumping the T10 canopy later, which has no steering capability other than slipping the canopy.
Here is another photo of the harness:
This tells me that the top cover had to be rotated so that the straight edge was up in order the release the harness from their place in the Darling Quick Release. In order to do that, the pin had to be pulled. Actually, a piece of metal which resembled a clothespin, but would expand to go around the center post so that the plate could not be pressed against had to be pulled out first. This was a very good, very adjustable quick release. However, I just looked over our Pararescue Operations Regulation from that era, and we did not use the Darling Quick Release on our parachute harnesses. We had gone to a different configuration with a chest strap hook going into a ring, and separate quick release hooks and rings for the leg straps to go into the harness. But, this regulation is from 1975, and it is possible that we used it earlier in the 1960s, as I remember it well. I'm also sure it was being used in the 1950s jumps pictured above.
SeaRat
PS--I just was going through my little box of things, and found this photo of me at Fort Benning in 1967. You can see the Darling Quick release better in this photo.