Boeing has installed the 3rd RS-25 engine into the Artemis III Core Stage. This engine, E2048, has flown 10 times before.
The right Center Center segment has also been integrated with its Aft Center segment!
NASA has completed functional testing of the Artemis III Core Stage and has begun RS-25 Engine installation!!
NASA has installed RS-25 E2054 & E2057 on the core stage so far with E2054 having flown 15 times and E2057 has flown 9 times.