A USAF P-4 crash fighting truck discharging foam from the roof turret during a training fire. Picture taken by the submitter at Point Mugu Naval Air Station in 1984.
If it's at Pt. Mugu, it's a Navy P-4. USAF crew members stayed in the cab during turret operations using in-cab controls; plus truck is a darker yellow than the USAF version.
Added by McFire on 23 August 2012.