This page from the squadron history of Marine Heavy Helicopter Squadron 463 (HMH-463) honors LtCol Robert R. Leisy, who commanded the unit from September 1970 to March 1971. Known by the call sign 'Dimmer,' HMH-463 flew CH-53 helicopters in support of Marine and allied operations during the Vietnam War, including combat rescues, resupply missions under siege, and support for Operation Lam Son 719 into Laos, as well as humanitarian flood-relief operations that saved thousands of lives. Project: 219439