Yeah, the US doesnt really do all out war these days, even in South America in the 80's it was kept mostly at arms length w/ local agents, death squads etc. and there's the drip feed of drone attacks, ongoing atrocity in Gaza, generally sticking to the general principles of low intensity conflict.
Iraq and Afghanistan have had their moments, Fallujah being the obvious example (including the bombing of hospitals, use of WP and experimental weapons), but of course you still end up with a million plus dead, a country in ruins and a destabilised region. Libya is an example of how even a limited intervention can spiral out of control causing untold disruption beyond the theatre. Post-war, Vietnam has yet to be equalled in terms of scale, cynicism, devastation and viscousness. 5+million dead, torture, chemical weapons, over 3 times the amount of bombs dropped than the entirety of WWII, brutal bombing campaigns and then coups in Laos and Cambodia leading ultimately to genocide.
There's also your run of the mill support for dictatorships of course, Yemen I think has the potential to spiral wildly out of control if the Saudi blockade continues and famine hits. Death tolls are currently wildly underestimated and there's over a million people at risk of starvation.