 When the 11th Air Assault was redesignated as the 1st Cavalry Division and sent to Vietnam, the 3/377th became the 2nd Battalion, 20th Artillery (using the radio call sign "Blue Max").This was the first unit designated and organized as ARA to take part in combat operations.The 4/77th Artillery joined the 101st Airborne Division in 1969 when the 101st was converted to an airmobile division, becoming the second active ARA battalion.