50 years ago today.
laststandonzombieisland.com
The number of fleeing refugees they could pack on a CH-53, once the gloves were off and pressure on, was amazing, as retold by retired Sgt. Maj. Michael G. Zacker:

Just in case things get rowdy
50 years ago today. Official period caption, 1st Marine Brigade aboard the carrier USS Hancock (CV-19) on 28 April 1975. Operation Frequent Wind. “Sgt. M.C. Murdock, assigned as a side gunner…

HMH-463 USS Hancock CH-53 marine Frequent Wind 28 April 1975
The number of fleeing refugees they could pack on a CH-53, once the gloves were off and pressure on, was amazing, as retold by retired Sgt. Maj. Michael G. Zacker:
“Our 53s were picking up 60 (evacuees). On our second load, we took on three sticks since we had no problem with 60, so then we had 90 aboard. On the third flight, we still had room on the ramp, and so we waved the CIA guy to have him send another stick. With a six-man crew and about 120 passengers, we left the DAO compound just east of Saigon for the Hancock at sea.”