South Vietnam Combat Zone UAP 1968

In July 1968, during the height of the Vietnam War, multiple US military installations in I Corps — the northernmost tactical zone of South Vietnam bordering the DMZ — reported luminous orbs conducting sustained overflight operations. The incident lasted approximately one hour with continuous observations from USAF aircrews, USMC radar at Da Nang, and Army personnel at forward fire bases. The orbs appeared impervious to radar lock by airborne intercept radar and performed maneuvers that precluded any conventional aircraft explanation. Personnel at forward firebases reported compass failures, radio interference, and complete shutdown of some electronic fire control systems during the overflight period. Given the critical national security implications — US forces were engaged in active combat — the incident was classified at Top Secret under JANAP-146 and CINCPAC special compartment procedures. It is cited in declassified AATIP contractor reports as one of multiple documented cases of UAP sensor interference with military combat systems.