found: Work cat.: Operation Pegasus: 1st Air Cav. Div., Apr. 1-2, 1968.
found: Vietnam War: an almanac, 1985:Chronology (January 20 - April 14 1968; Operation Pegasus begins in early April)
found: Dictionary of the Vietnam War, 1988(Operation Pegasus was the codename for the 1st Cavalry Division, Airmobile, operation to relieve the siege of Khe Sanh in April 1968)
found: Virtual Vietnam Archive operation search, Mar. 1, 2005(Operation Pegasus; also known as Operation Lam Son 207; carried out April 1 through 15, 1968, in the Quang Tri Province near Khe Sanh; combat operation to relieve the Siege of Khe Sanh)