USAF Mobile Water Supply (MWS) Fire Practice Test

In this arrangement, the portable water tank acts as the on-site water source for the attack apparatus, and the dumpsite pumper draws water from that same tank to supplement the supply. That setup defines Portable Water Tank Operation: the water source is the portable water tank feeding the attack engine, and other units (like the dumpsite pumper) may draw from it as needed. This differs from nurse tanker operation, where a nurse tanker provides the water, gravity dump operation, which relies on gravity from a dump tank, or direct draft operation, where the attack engine drafts directly from a source without using the portable water tank as the supply.