A MAFFS unit is a pressurized 3, gallon tank system containing either water or a water-based retardant designed to fit into a C aircraft. High school diploma or equivalent; some employers may require relevant postsecondary education, such as an associate’s degree in fire science. Firefighters also use shovels to scape away needles and other duff as they construct firelines down to mineral soil. Aurelio Locsin has been writing professionally since Forest fire fighters work for logging companies, contractors, and the government. To become a wildland firefighter, you must be between the 18 and 35 years old and pass a physical fitness test.