The Redneck International (REDINTERN) knows no borders!
That's why we have mobile homes!

Seriously we did some work on this issue in the Company-level SOSO series of newsletters. CALL Newsletter 06-16 VOL 6 Tactical Marksmanship and Counter Sniper Ops. As it is FOUO you will have to look for it on the CALL gateway. Note also that we made use of a USMC X-File on desgnated Marksmen as well.

Best

Tom