I was just looking around on eBay Completed Items and came across this one:

http://cgi.ebay.com/1960-Dodecanece-Islands-USCGC-Courier-QSL-Card_W0QQitemZ320001745119QQihZ011QQcategoryZ3514Q QrdZ1QQcmdZViewItem

Though an amateur radio QSL, this guy was operating on board the United States
Coast Guard Cutter 'Courier' which was in the Agean to relay VOA programming.

See also:

http://en.wikipedia.org/wiki/USCGC_Courier

http://www181.pair.com/otsw/USCGC_Courier.html

http://www.offshore-radio.de/fleet/courier.htm

dxAce
Michigan
USA