The rocket engines used in the SeaLaunch rockets are Russian, too!
Pretty soon they’ll be making our fighter jets for us.
HOLD EXTENDED purge line issue
First...the launch is on hold while they look at an overheating issue with the Centaur interstage motors. Launch is likely not going to be on-time, but they have a 2-hour launch window, so it still may happen of they get the issue taken care of in time.
Secondly, a correction. The engine on the Atlas V 1st stage is the RD-180, NOT RL-150. Dunno where I got that one.