Let's see invaded a small island in the Caribbean, Central America insurgency via the CIA, a bombing attack on Libya, a dumb arms for hostages deal, sending Marines to Lebanon on a peace keeping mission that was a disaster continued Carter's policy of arming mujaheddin.
Harry Truman sided with pro Hitler thugs and put them in power in Greece, Korea (50,000 Americans dead). Eisenhower Iran and several other brush fires, started down the path in Vietnam, a couple of CIA coups (not going to look them up now. Kennedy Bay of Pigs, Vietnam. Johnson Vietnam Escalation (50,000 American's dead), Nixon bombing of Cambodia, started Vietnam draw down. Ford, can't remember anything. Carter let Iran fall then had a failed hostage rescue, and with Zbig started arming the mujaheddin in Afghanistan. Bush I Panama, first gulf war. Clinton cruise missile attacks in Iraq, illegal war in the Balkans. Bush II Afghanistan and Iraq War II huge loss of life, endless war and started drone strike program. Obama Afghan surge, expanded drone strikes in multiple countries, overthrow of Libyan government, extreme intervention in Syria creating a humanitarian disaster, idiotic support of Muslim Brotherhood in Egypt, massive weapons sales to ME theocracies, confrontation with Russia, drew down Iraq forces, now sending forces back to Iraq.
I'm sure I missed a few along the way, but those are the highlights. Reagan looks pretty freaking tame in comparison.