US airplanes attack North Vietnam’s largest air base, Phuc Yen, for the first time in a combined Air Force, Navy, and Marine strike. During the attack, the Air Force downs its 69th MiG. The destruction of this MiG-21 marked the first time a weapons controller aboard an airborne radar aircraft (in this case, a Lockheed EC-121D) had ever directed a successful interception.
The Pentagon awarded a contract worth over $2 billion for the next batch of F-35 engines to Pratt & Whitney on June 5. The deal for Lot 17 F135 engines, totaling $2.02 billion, is expected to be completed by December 2025.