Share This Article 1. During the Blitz this three letter acronym was used to label undetonated ordnance. UXB UXO BOX UDO 2. From 1912 to 1938 a US Army Infantry regiment garrisoned this Chinese city. Tientsin Shanghai Canton Nanking 3. The US military helped celebrate Ho Chi Minh’s 77th birthday on 19 May 1967, by doing this. Bombing Hanoi’s main power plant Mining Haiphong Harbor Attacking his Presidential Headquarters Bombing Hanoi with B-52s Loading …