I was born in 1974. Even discounting the events at the end of the Vietnam War (1973-1975), this is what I can recall off of the top of my head:

1980 - Failed rescue of Iranian hostages.

1982 - invastion of Grenada. Bloodless, yes, but still armed intervention.

1983 - suicide bombing in Beirut. This after some Marines were sent into the maelstrom that was the Lebanese Civil War.

1989 - Panama. Capture of Noriega.

1990-1991 - Persian Gulf War buildup and attack.

early 1990s - Somalia.

1999 - Yugoslavia/Kosovo.

2001-present - Afghanistan.

2003-2010 (or later) - Iraq, part deaux. The sequel was bloodier, more violent, and pretty much sucked ass.

And now apparently Syria will be next. No more than 6 years in my nearly 40 years has the US managed to avoid whipping out its military dick. Sure, some of the justifications are better than others, but here's a sobering question:

How many other nations can you name that have been as involved or more so in the affairs of other, presumably sovereign nations on a military level? It's depressing to consider this and the alternatives do not make for cheery thoughts, either.