This question resolves to "yes" if U.S. military on active orders are deployed to Haiti with an active peacekeeping mission. 

Things that do not resolve the question to "yes" include: delivering supplies, including weapons or vehicles; training Haitian military or police in Haiti, etc.

Official announcements or documentation of US troops being used offensively against locals (as opposed to defending areas where they are conducting training/logistics missions) will resolve to "yes".

Extreme ambiguity will resolve N/A. For example, highly ambiguous documentation without official government pronouncement.