(One of my favorite WF cans, an Esslinger from Pennsylvania. This one even has a stamp on the lid giving details on the exclusive Venezuelan distributor)
These cans are also referred to as WF and WFIR cans. They feature a statement which designates them as Withdrawn Free of Taxes for Exportation. They are often found as Olive Drab WWII cans (aka: OD, Camo, or camouflage) but many examples of normal cans also feature the WF statement. They were sold on military installations in the U.S., cruise ships which carried them to International waters, U.S. military bases overseas, and other non-US locations. The normal person running into a beer store in the U.S. in the 1940's would have picked up an IRTP (Internal Revenue Tax Paid) can rather than a Withdrawn Free can. That's what makes these cans more difficult to obtain, in general (however, there are some fairly common WF cans).
