4737.4 Warships?

Over the past year I have caught some interesting traffic on 4737.4 kHz USB. At first I didn’t pay much attention to this frequency, as the comms sounded quite casual in nature. It wasn’t until hearing them mention warships, then I started to take notice. In the clip below you will hear a station identified as “0301” calling “9701 Atlas” reporting they completed the AAV2 with Warship 69, and were now engaging with Warship 38.

I also logged this frequency last summer and heard phrases such as “Red Coast Guard” and “Red Territorial Waters”. The users refer to this as Tac 4 and also gave mention of VHF marine channels. Callsigns heard include: 0301, 0302, 9701 Atlas, Caw 1 and 120. Both times monitored was during daylight hours so probably coming from the offshore ranges in the Southern California area. If anyone knows who they could be please advise.