X0206 3 2024-09-27 1 0002011286 Amentum Holdings, Inc. AMTM 0001173003 DEMETRIOU STEVEN J. C/O AMENTUM HOLDINGS, INC. 4800 WESTFIELDS BOULEVARD, SUITE 400 CHANTILLY VA 20151 true true Executive Chair Exhibit 24 - Power of Attorney /s/ Paul W. Cobb, Jr. Attorney-in-fact 2024-09-27