Disheartening

This would make for a bad day:

The NYT talks to "more than a dozen" Delta Company soldiers in Iraq and fronts word that most of them are disheartened by their mission, and many feel they're stuck in a seemingly endless cycle of violence that they're powerless to end. Members of the unit say they became particularly disillusioned when they realized members of the Iraqi army that the U.S. military had trained were attacking them.