Operation JUNCTION CITY took place from February to May 1967.
The 2nd Battalion, 503rd Infantry (Airborne), 173rd Airborne Brigade conducted a airborne assault vicinity of Katum RVN on 22 February 1967.
"On February 22d, 1967, paratroopers of the 2d Battalion, 503d Infantry, 173d Airborne Brigade, parachuted into a wide clearing in the jungle of War Zone C as part of Operation Junction City. Their mission was to form a blocking force near the crossroads hamlet of Katum, South Vietnam, to support a large-scale cordon and search by U.S. forces. The 780-man airborne task force was delivered in two sorties of aircraft from Bien Hoa Airbase. The personnel drop of thirteen C-130 Hercules aircraft arrived over Drop Zone Charlie at 9:00 a.m. General Jack Deane, Commander of the 173d Airborne Brigade, Lieutenant Colonel Robert Sigholtz, Commander of the 2-503d Task Force, and Sergeant Major Harold Proffitt led the jump from the first aircraft. A total of 778 troopers hit the silk in two passes over the small drop zone, settled to the earth, and began assembling without any enemy opposition. Thirty minutes later, ten heavy drop C-130s arrived and dropped six 105mm howitzers, four 4.2 inch mortars, six 81mm mortars, four 3/4-ton trucks, five jeeps, six M274 "Mule" vehicles, one trailer, and 3900 rounds of artillery and mortar ammunition. By 10:00 a.m. all men and equipment were deployed into blocking positions and the command post and artillery firebase were established. As units from the U.S. 1st and 25th Infantry Divisions, the 11th Armored Cavalry Regiment, and the 173d Airborne Brigade began closing the horseshoe around suspected Vietcong and North Vietnamese Army (NVA) positions, Operation Junction City became a series of small unit firefights for the paratroopers. On February 28th, the "Sky Soldiers" of the 173d overran the Vietcong Central Information Office, a key enemy propaganda facility. As the multi-divisional attack continued through mid-May, major battles raged around the horseshoe with three Vietcong regiments and one regiment of NVA regulars. Operation Junction City succeeded in driving major enemy forces from War Zone C across the border into sanctuaries in Cambodia. The operation was terminated on May 14, 1967. "
The 3rd Brigade of the 82nd Airborne Division served in Vietnam.
"On 12 February 1968, the 3d Brigade was alerted for deployment to the Republic of Vietnam in response to the TET Offensive. After thirteen months, the Brigade had helped secure the region south of the DMZ and redeployed to Fort Bragg, North Carolina in March 1969, the only Brigade of the 82d Airborne Division to participate in the Vietnam conflict. "
The 3rd Brigade may (MAY) have conducted "proficency" jumps in Vietnam, but conducted no "combat jumps".
My father's experience as the Chief of Staff of the 101st Airborne Division in Vietnam was that they planned a lot of proficency jumps but "shit happened".
The only other US "combat jumps" in RVN were conducted by SF.
VIETNAM, 1967-71, 6 Operations (Junction City, Harvest Noon, Blackjack, Oregon, Blue Max, Teams -, RT Idaho (3) and the recon company commander, One Zero, Storter and Wisconsin),
LAOS, 1970, 1 Operation (Team Florida)
NORTH VIETNAM, 13 Operations (no names given),