Not limited to Constellation class, US navy is also to shift away from delayed Boeing's Orca for the XLUUV program
"Other early efforts for the PAE include shifting the Navy away from Boeing’s Orca for the Navy’s XLUUV program and Black Sea’s GARC for the service’s small USV program, finding a small UAV for use on guided-missile destroyers and new command and control software, according to the draft plan."