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Observation Squadron 67 (VO-67) was a clandestine United States Navy military intelligence aircraft squadron based in Thailand during the Vietnam War. Created in February 1967, the unit was deactivated in July 1968. During its period of activity, the squadron mainly flew missions over the Ho Chi Minh trail in Vietnam and Laos under the MUSCLE SHOALS mission known as Operation Igloo White, deploying electronic sensory devices from their aircraft. These sensors, known as the Air-Delivered Seismic Intrusion Detector (ADSID) and the Acoustic Seismic Intrusion Detector (ACOUSID), which would implant in the ground to detect North Vietnamese Army and Viet Cong supply movements along the trail.

Observation Squadron 67
Observation Squadron 67 (US Navy) insignia 1967.png
ActiveFebruary 1967- July 1968
CountryUnited States
BranchUnited States Navy
TypeObservation? (Remains classified)
RoleMilitary intelligence
Garrison/HQNakhon Phanom Royal Thai Air Force Base, Thailand
Nickname(s)"Ghost Squadron" "Gandy Dancers"
EngagementsVietnam War
An OP-2E Neptune of VO-67, a variant of a naval patrol bomber and anti-submarine warfare (ASW) aircraft specifically developed for the Muscle Shoals mission.

The squadron flew OP-2E Neptune aircraft, a modification of the P-2E Neptune maritime patrol and antisubmarine warfare aircraft.[1] Three unit aircraft were lost on combat missions with a total of 20 men killed.[2] The unit received the Navy Unit Commendation and, in May 2008, was awarded the Presidential Unit Citation for its highly classified missions and for its intense aerial support of the Marines during the Battle of Khe Sanh.[3]

The Arleigh Burke class destroyer, USS Milius (DDG-69) is named for Commander Paul L. Milius, USN, who received the Navy Cross for saving his seven-man crew while serving with VO-67. Commander Milius was lost in combat over the Ho Chi Minh Trail when his OP-2E aircraft, callsign Sophomore 50, was hit by anti-aircraft fire over Laos on 27 February 1968 and he ordered his crew to bail out. Seven of the nine men aboard were rescued. The remains of the eighth crewmember, ATN2 John Hartzheim, were identified on 19 February 1999. Although he exited his aircraft, Commander Milius was never seen again. He was listed as Missing in Action, presumed Killed in Action, and his remains never recovered.


  1. ^
  2. ^ Mobley, Richard (2015). Knowing the enemy: Naval Intelligence in Southeast Asia (PDF). Naval History and Heritage Command. p. 33. ISBN 9780945274780.
  3. ^
  • Unit members talked with KXTV in Sacramento, CA and WFMY News 2 in Greensboro, NC about their experiences. Watch the story here.

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