When the boat is launched there aren't a lot of Navy in sight and the hull is watertight but not much else. Gradually as systems are installed some Navy will show up to accept this or that system. Eventually the Captain shows up to formally accept the key to the door, to meet his crew, either the Blue crew or the Gold crew, and away they go.
I don't think Blue/Gold applies here. She's a Fast Attack. They have one crew. Only Boomers have two crews.
I don't believe they build them in that manner any more. When I worked for Newport News Shipbuilding, they and Electric Boat were perfecting the modular construction - basically, building an entire compartment and it's systems, then welding them together.