April 1 — 76 Anniversary of the U.S. Invasion of Okinawa, Japan (1945)
April 13 — Thomas Jefferson’s Birthday (1743)
April 15 — Congress ratifies peace with Great Britain (1783)
April 17 — 51st Anniversary of the safe return to Earth of Apollo 13 (1970)
April 18 — Patriot’s Day April 19 — American Revolution begins (1775)
April 22 — 51st Anniversary of the first observance of Earth Day (1970)
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