You are seeing YFB-17 (to be named USS NIHOA) being launched (lowered into the water) at PHNY on 25 July 1941. Not many ships were built at PHNY.
The OMAHA class cruiser is USS RICHMOND (CL-9).
As it happens, I pulled the 19-LCM box with the folders for YFB-17 on my last trip to NARA in March, just so I could study the ships in the background. There were the two photos above that Jeff posted, taken during the launch sequence on 25 July 1941. Across the way, there were the destroyer USS McCALL (DD-400), a few unidentified destroyers, and this OMAHA class cruiser. All three showed signs of being painted into Ms 1, which I was puzzled by. I had trouble ID'ing the cruiser, until I spotted the ship's boat tied up alongside the cruiser. The "RIC" on the bow of the boat told the tell that it was USS RICHMOND.
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There was another photo dated 25 July 1941, but that I suspect may have actually been taken the day earlier, that showed YFB-17 on the dock awaiting to be launched. In the background (very overexposed) was a view of two destroyers, USS McCALL and USS MAURY (DD-401). The two destroyers appear to be still painted in peacetime paint. The photos taken during the launching showed that the Ms 1 camo scheme was well in being applied. In the bottom two photos below, to the right behind YFB-17, can be seen USS REED BIRD (AMc-30).
What really puzzled me was why these three ships were only just being painted into Ms 1 in late July 1941 when many other Pacific Fleet units had been painted in Ms 1 in April 1941. I went back to the 1941 camo documents that I had been given to review if there was any mention of the three identified ships in these photos. In the initial camo evaluations there was mention that some ships were still painted in the peacetime color. But, I found no mention of McCALL or MAURY. However, USS RICHMOND was mentioned during May 1941 evaluations of the camo with submarines, while USS RICHMOND was the Flagship of the Pacific Fleet Submarine Scouting Force. During the May 1941 evaluations of the various painted camo ship targets against submarines. In the observations, there was comparison to USS RICHMOND painted "light gray". In June 1941, USS RICHMOND was reassigned to Cruiser Div 3.
So, it appears that USS RICHMOND didn't get painted until late July 1941. It may well be that the Pacific Fleet was repainted in stages. When Ms 1 was first ordered, 5-D paint wasn't available. As an interim measure BuShips told the forces afloat to use the existing peacetime light gray and mix it with black paste. The paint looked like 'real" 5-D except it was glosser. Many ships repainted with the planned 5-D paint when it was available.