At first we heard the SEALs killed in the downed chopper were on a rescue mission.

That story has now changed:

However, a U.S. military official confirmed Tuesday that the SEALS were called in as an ‘immediate reaction force” when the Army Rangers who were on the ground in a firefight saw some Taliban break off and begin to escape.
The Rangers wanted the SEALS to go after those insurgents, the official said, adding the Rangers were “not pinned down” but simply wanted more combat power.

We’re using Navy SEALs to kill individual cavemen.