On 5/17/2016 11:15 PM, Richard Aiken
      wrote:

    

    
Without researching it, I expect that the reason the
      Army decided against HE and the Marines for it was the different
      anticipated Armor missions.

    

    

    It looks like the Marines adopted it in 2011 (Rheinmetall seems to
    be pushing it as having been battle tested by the USMC) so before
    that they were both making the same choice - possibly because there
    wasn't an option until then.