No you misunderstand, Iraq and Afghanistan are pretty much a tie in my mind, and should the USA invade anyone in the future, please sanction us until I starve to death or leave.
I don't think 900 servicemen supporting the local SDF to defend certain locations in a de facto autonomous region is really comparable in any way to Russia sending 200,000 soldiers to conquer a sovereign nation and indiscriminately shell all major cities.
If eg. mexico bombed the shit out of USA, because it didn't like their leaders, basically destroyed the country, change the government, kill a bunch of people, and then leave behind 900 mexican soldiers, would you see those soldiers as "someone defending you", or as an occupation?