Obama, at the very least, personally authorized http://www.bbc.co.uk/news/world-middle-east-15121879

Bush 2 I think is clear, c.f. iraq and afghanistan, other targeted interventions

Clinton: http://www.history.com/this-day-in-history/clinton-orders-ai... as well as kosovo, mogadishu, and other interventions

Bush 1 and the invasion of Iraq, part one, as well as other more targeted actions

Reagan: http://news.bbc.co.uk/onthisday/hi/dates/stories/april/15/ne...

Carter: http://en.wikipedia.org/wiki/Iran_hostage_crisis

Ford, not counting the Vietnam War: http://en.wikipedia.org/wiki/Mayaguez_incident

LBJ and Nixon both obviously one can count the Vietnam war.