SEALs undergo tactical mobility training on GMV-N (modified HMMWVs).
Note the M2 .50 machine gun on the GMV in the foreground.
The GMV-N is the Naval Special Warfare variant of the Ground Mobility Vehicle.
These are based on HMMWV vehicles but with a series of modifications for special operations use.
The training was being carried out by Naval Special Warfare Group Two Training Detachment (NSWG-2 TRADET).