During the Vietnam War the 1st Engineer Battalion supported 1st, 2nd, and 3rd Battalions of the 1st 5th and 7th Marines in combat operations from July 1965 through April 1971, operating from Qui-Nhon, Chu-Lai and Da-Nang, the most famous of which was Operation "Starlight" conducted August 1965 where Sgt. Robert E. O'Malley was awarded the first Medal of Honor of the Vietnam War.
engineer | Battalion | Louis Mountbatten, 1st Earl Mountbatten of Burma | Horatio Nelson, 1st Viscount Nelson | Herbert Kitchener, 1st Earl Kitchener | Charles Cornwallis, 1st Marquess Cornwallis | 1st United States Congress | Frederick Roberts, 1st Earl Roberts | Bernard Montgomery, 1st Viscount Montgomery of Alamein | William Cecil, 1st Baron Burghley | Robert Harley, 1st Earl of Oxford and Earl Mortimer | George Villiers, 1st Duke of Buckingham | battalion | Thomas Wentworth, 1st Earl of Strafford | William Pitt, 1st Earl of Chatham | Joseph Lister, 1st Baron Lister | Robert Baden-Powell, 1st Baron Baden-Powell | John Scott, 1st Earl of Eldon | Henry Brougham, 1st Baron Brougham and Vaux | Edward Seymour, 1st Duke of Somerset | Robert, 1st Earl of Gloucester | Guy Carleton, 1st Baron Dorchester | Garnet Wolseley, 1st Viscount Wolseley | Douglas Haig, 1st Earl Haig | George Monck, 1st Duke of Albemarle | Frederick Schomberg, 1st Duke of Schomberg | Edward Hyde, 1st Earl of Clarendon | William Slim, 1st Viscount Slim | Sir Arthur Harris, 1st Baronet | Richard Howe, 1st Earl Howe |