OPL
On premise laundry, military barracks, housing, etc. Laundry is "free" meaning no coin slots. Afterall it's not like anyone off the streets can get in, and how much laundry does your average enlisted man/woman, or officer have?
Was watching the PBS program "Carrier" the other night, and apparently the washers and dryers on ships and submarines are "free" as well. IIRC this particular program's ship had Neptunes, or maybe it was SQ, didn't really look beyond knowing it was a front loader. Interesting item: while the machines are free, apparently many military persons pay someother military person to do his/her laundry. On the "Carrier" program, one was paying someone else ten or so dollars to do his wash, but apparently the "launderer" wasn't separating whites from darks, so the customer took his business elsewhere.
Have seen many auctions on fLeaBay and elsewhere from sellers hawking used SQ washing machines from military bases. Don't know why the Armed Services only keeps machines for three or so years per contract, but there you go; our tax dollars at work.