There aren't a lot of calls for investigations in Iraq or Afghanistan that the US avoids. And almost all are international investigations with somebody looking over the JAG's shoulder. There are dozens going on all the time. Even you can observe if you sign a form saying your survivors won't sue if you get killed observing.. You can observe all you want.
Report: Palestinian, 18, killed in clashes with IDF in West Bank (Haaretz)
from the article: U.S. denies pushing for Gaza flotilla probe at UN