U.S. Coast Guardsmen, or machinery technicians (MK), assigned to Station Mayport, Fla., conduct engine maintenance on a station smallboat while at Coast Guard Sector Jacksonville, Florida, April 5, 2022. MKs work in all areas of machinery operation and maintenance from internal combustion engines to environmental support systems, hydraulics, basic electricity, and areas of hazardous material recovery and control. (U.S. Coast Guard photo by Petty Officer 2nd Class Barry Bena)