My nephew is a USMC 0331 Machine Gunner who was trained on and still uses the M240B although the U.S. Army is looking to replace their GPMG's with the XM250 which fires that crazy hot new round: the 6.8 X 51 SIG Fury. As the USMC is the red-haired bastard step-child of the U.S. military, I'm sure we'll see their use of the M240 for some years to come.