Historical clue formulations

• It brought Hope to the world — 2021-04-04
• Morale booster on base — 2016-03-12
• Morale-boosting mil. event — 2013-06-09
• Base entertainment — 2010-06-09
• Noted 37-Across venue — 2003-05-29
• G.I. entertainment — 2001-05-20
• G.I. entertainment — 1997-02-16