Are they teaching this firing grip in the USMC now?

U.S. Marine Staff Sgt. Nicholas Rumple aims at his target during Certification Exercise (CERTEX) aboard the USS Essex (LHD 2) off the coast of San Diego April 10, 2015. Rumple is a member of the 15th Marine Expeditionary Unit’s Maritime Raid Force. Deck shoots give the Marines the opportunity to improve their marksmanship skills while at sea. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released)

I wonder.  Are they teaching this firing grip in the Marines now?  We all know where it originated...Costa and Haley's "C-Clamp" method.

I've always thought that it was mostly a 3 gun match thing or at best for LIMITED use in CQB.  Now everywhere I look people are putting it into action.

What has me spinning on this is the fact that Costa and Haley always used the technique with standard length barrels with forends that provided enough real estate to make it "relatively" practical.

What am I talking about?  Check out the Marine again in the top pic.  He's just a few short inches from covering the muzzle with his own hand.

If this is being taught with the M4 hit me up.  I'd like to know the reasoning, proper technique and the rationale behind its use in a combat organization and not simply for 3 gun matches.

Sidenote:  First.  All you Marine haters pound sand.  I've seen so much goofy stuff being done by the other services that it would fill the internet.  I don't post about it because I really don't care. They're not Marines.  Second.  This isn't about bashing the Marine in photo.  I've seen the technique quite a bit and this photo spurred me on to finally ask the question.  And then last.  Save the butt hurt.  Its simply a question.  I'm not indicting current training techniques, just wanting to learn more.