General Electric TF34-GE-400B is a retired high-bypass turbofan variant used as the two-engine powerplant of the S-3B Viking, with 9,275 lb static thrust per engine. The U.S. Naval History and Heritage Command identifies the S-3B's phased withdrawal as complete in 2009, and NAVAIR records the Viking's official Navy retirement in 2009. The two recorded S-3/S-3B installations remain distinct context, and no broader S-3 subvariant mapping is asserted.