You can't look at just the past decade to be fair. Let's see... in the 20th Century...

Woodrow Wilson - WWI
Franklin Roosevelt - WWI part 2
Harry Truman - Korea
John Kennedy - Vietnam - the beginning (but it might have been Ike... depending on your perspective. But Kennedy definitely escalated Nam when the French left)
John Kennedy - Bay of Pigs - the closest we came to a nuclear war
Lyndon Johnson - Vietnam - the escalation part 2

I'll give you Reagun for Grenada and
Bush Sr. for Iraq part 1
and the Shrub for Iraq part 2... but I think that's the only reason the Democrats are so antiwar right now. The Republicans are stealing their thunder......
Actually, Eisenhower sent in the first advisors to Vietnam when the French were flailing about and exiting over there. LBJ escalated the war, but Nixon involved Cambodia--illegally (imagine that).

And I think you left out the Iran-Contra episode with Reagan and Bush I. I did a research paper on this and discovered a lot of really bad stuff that the US did that was never brought out in the media. They may not have been convicted, but the men involved should have gone to jail with Reagan and Bush being impeached. And what does it say for the current Bush administration that it hired the majority of the crooks from the Iran-Contra episode?

And what else does it say for the current Bush show that all the players never served time in the "real" military yet they do not hesitate to send men and women to die for their cause?