Historical clue formulations

• ___ Bay, former U.S. base on Luzon — 2016-01-31
• ___ Bay, former U.S. base in the Philippines — 2013-03-17
• ___ Bay (South China Sea inlet) — 2007-08-03
• ___ Bay, Philippines — 2000-09-03
• Former Philippine base _____ Bay — 1995-09-30