Historical clue formulations

• Pentagon div. — 2025-03-23
• Pentagon org. — 2024-07-10
• Pentagon inits. — 2022-11-27
• The Pentagon houses it: Abbr. — 2022-02-08
• Pentagon inits. — 2021-12-11
• Pentagon letters — 2019-02-02
• Its HQ is the Pentagon — 2018-10-21
• The Pentagon inits. — 2016-05-01
• Pentagon outfit, briefly — 2015-03-13
• U.S.N. and U.S.A.F. div. — 2010-12-18
• Cabinet inits. since 1947 — 2008-01-06
• Cabinet div. — 2005-03-05
• Donald Rumsfeld's bailiwick: Abbr. — 2003-12-04