Only relating to military history please.
February 17th 1568 : Holy Roman Emperor agrees to pay tribute to the Sultan for peace
February 17th 1670 France & Bavaria sign military assistance treaty
February 17th 1676 Kings Charles II & Louis XIV sign secret treaty
(not military but how can I overlook this)
February 17th 1882 1st Test Cricket match played at Sydney Cricket Ground
February 17th 1915 Edward Stone, 1st US combatant to die in WW I, is mortally wounded
February 17th 1943 NY Yankee Joe DiMaggio, enlists into the US army
February 17th 1943 Hitler visits fieldmarshal von Mansteins hq in Zaporozje
February 17th 1943 Gen-major Bradley flies to Wash DC
February 17th 1944 Battle of Eniwetok Atoll begins; US victory on Feb 22
February 17th 1944 US begins night bombing of Truk
February 17th 1953 Baseball star/pilot Ted Williams uninjured as plane shot down in Korea
(sorry for the next two ;)
February 17th 1973 Rodney Redmond scores 107 on debut v Pakistan, his only Test Cricket
February 17th 1976 NZ scores their 1st innings win in Test Cricket, v India
February 17th 1983 US performs nuclear test at Nevada Test Site
February 17th 1986 Libyan bombers attack N'djamena Airport in Chad
February 17th 1988 US Lt Col Wm Higgins kidnapped by Lebanese terrorists & later killed