C-130J MAFFS II Internal Workings
The Modular Airborne FireFighting System or MAFFS is a self-contained unit used for aerial firefighting that can be loaded onto a C-130 Hercules, a military cargo transport, which then allows the aircraft to be used as an air tanker against wildfires. This allows the U.S. Forest Service (USFS) to utilize military aircraft from the Air National Guard and Air Force Reserve to serve as an emergency backup resource to the civilian air tanker fleet.
While the legacy Modular Airborne Firefighting System, or MAFFS, is like a bucket, the new MAFFS II is more like a SuperSoaker – only as much retardant as necessary is dispensed out of its single, 3,000-gallon tank to allow for multiple passes over a fire.
Canadian Aviation Blog
Photo Source:US Air Force