What is "zrcv"

The ZRCV was a large dirigible aircraft carrier proposed by the Lighter-than-Air Bureau of the Navy Department and the Goodyear-Zeppelin Corporation. It would have been a nine-million cubic foot airship designed to carry nine Douglas-Northrop BT–1 dive bombers.

Building the ZRCV became impossible when the Roosevelt administration placed an upper limit on the size of new airships.