F4F-4 Wildcat of VF-6 has its six .50 caliber machine guns tested on the flight deck of USS Enterprise CV-6,April 10 1942.Note open gun bays in the plane's wings and markings below the cockpit "6F9" with no dashes between letters and numerals.(rudeerude)

VF-6

The U.S. Navy light cruiser USS Oakland CL-95 in San Francisco Bay, California, with the San Francisco waterfront in the background, 2 August 1943.(rudeerude)

USS Oakland 

Testing machine guns of Grumman F4F-4 Wildcat fighters aboard USS Ranger CV-4, while en route from the U.S. to North African waters for Operation Torch.(rudeerude)