Actually it is. The formal term is "War crime of attacking personnel or objects involved in humanitarian or peacekeeping mission."

Additionally there is: "War crime of killing or wounding a person hors de combat."

Then there's: "War crime of attacking protected objects." That includes..."hospitals or places where sick and wounded are collected..."

Sometimes the education level of the posters on this site actually scares me. The ignorance is astounding. Google is a wonderful thing. Some folks should try it BEFORE posting.