World Library  
Flag as Inappropriate
Email this Article

Operation Thunderhead

Article Id: WHEBN0017513159
Reproduction Date:

Title: Operation Thunderhead  
Author: World Heritage Encyclopedia
Language: English
Subject: United States Navy SEALs, Operation Medina, Farm Gate, Operation Iron Hand, Operation New Life
Publisher: World Heritage Encyclopedia

Operation Thunderhead

Operation Thunderhead was a highly classified combat mission conducted by U.S. Navy SEAL Team One and Underwater Demolition Team 11 (UDT-11) in 1972. The mission was conducted off the coast of North Vietnam during the Vietnam War to rescue two U.S. airmen said to be escaping from a prisoner of war prison in Hanoi. The prisoners, including Air Force Colonel John A. Dramesi were planning to steal a boat and travel down the Red River to the Gulf of Tonkin.[1]

Lieutenant Melvin Spence Dry was killed on the mission. He was the last SEAL lost during the Vietnam War. His father, retired Navy Captain Melvin H. Dry, spent the rest of his life trying to learn the circumstances surrounding his son's death. The details, however, were long shrouded in secrecy.


In April 1972, SEAL Team One left Subic Bay in the amphibious-transport submarine USS Grayback. The plan was to launch the team at night from the submerged submarine in a Swimmer Delivery Vehicle (SDV) piloted by two UDT-11 operators and head for a small island off the mouth of the Red River.

On 3 June 1972, Lieutenant Dry decided to conduct a clandestine reconnaissance mission that night. Shortly after midnight the team launched from Grayback but a combination of navigation errors and strong current took them off course. After an hour, the crew was compelled to abort the mission. They were unable to locate Grayback and they were forced to scuttle their underpowered SDV after its battery power was exhausted.

The next morning, the team was rescued a few miles off the coast. The four men were flown to the USS Long Beach, Operation Thunderhead's command ship.

At 2300 hours on 5 June, the men were to be transported back to Grayback by helicopter. The team would perform a night water drop next to the submarine. During briefings with the pilots, Lt. Dry and Chief Warrant Officer (CWO) Martin emphasized the maximum limits for the drop were 20/20-- 20 feet of altitude at an airspeed of 20 knots, or an equivalent combination.

When the helicopter arrived near Grayback's expected position, they could not locate the submarine. As they desperately searched for the submarine's beacon, Lt. Dry and his men prepared to enter the water and lock into the submerged submarine.

According to CWO Martin, the drop was conducted downwind, adding another 15 to 20 knots of forward velocity when the jumpers hit the water. Lt. Dry died immediately of "severe trauma to the neck" caused by impact with the water, according to the Navy's death report. Two other team members were badly shaken, and one was seriously injured.

Several hours earlier, Grayback launched its second SDV but the team abandoned their mission when their air ran out; subsequently, they made an emergency free ascent to the surface. After seeing a strobe light and hearing voices, the two teams rendezvoused.

At about 0100, they found Lt. Dry's lifeless body, inflated his life vest, and held him in tow as they swam seaward to be rescued. An HC-7 helicopter rescued the men at dawn and returned them to the Long Beach.

On 12 June, the remaining team members were transferred back to Grayback. With the likelihood of a successful prisoner escape by sea lessened by the recent U.S. mining of North Vietnam's ports and rivers, Operation Thunderhead was soon terminated.

Because the mission was classified, the Navy did not acknowledge Dry's death as a combat loss until February 2008, when he was posthumously awarded the Bronze Star for Valor.[1]


  1. ^ a b Eisman, Dale, Navy honors SEAL killed in secret mission in Vietnam, The Virginian-Pilot, 26 February 2008.
  2. ^ Captain Michael G. Slattery, U.S. Navy (Retired) and Captain Gordon I. Peterson, U.S. Navy (Retired) (2005), Spence Dry: A SEAL's Story, Copyright 2005, U.S. Naval Institute Proceedings.

External links

  • U.S. Naval Special Warfare Command Website official site.
  • Operation Thunderhead website
  • USS Grayback 574
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from iCloud eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.