Their engines are jet turbines that use the jet's thrust to spin a prop.

FORBES: Magazine Article

After all, the strains on a jumbo jet turbine are far greater: 400 takeoff and landing cycles in a year, massive swings in thrust and temperature, sucking in unfiltered air.

FORBES: Energy

Four turbofan jet engines, with afterburners, are each able to provide more than 30, 000-lbs of thrust.

BBC: Profile: B-1 bomber