19-N-48940
USS Wahoo (SS-238) At the Mare Island Navy Yard, California, 10 August 1942. Circles and associated text mark recent alterations to the submarine. Note: Target bearing transmitter on the after bridge deck; antennas for SDa radar (mounted atop the after mast on the periscope shears) and SJ radar (in front of the shears). 19-N-33840