comment: >
  
  The work the American was doing is also a big part of the lack of retaliation. Operating in/around a warzone has certain risks that this person willingly accepted. Would be different if it was "bus of American tourists in Eastern Poland".
context: A paramedic friend of mine just deployed alongside this guy and narrowly avoided injury in the attack, and has been sent back home. >
  
  No, the US will not retaliate. The man did good work and deserves respect, but he wasn't there under the auspices of the United States Government.