While I've never served at the National Guard Marksmanship Training Center, I am currently a marksmanship trainer for the ILNG Small Arms Readiness Training Section. It is an excellent gig. We train units to pass yearly qualification at a higher percentage, train units prior to deployment in advanced marksmanship, organize the yearly TAG match and other shooting competitions, and shoot in regional and national matches ourselves. I'm not sure if you have a SARTS team in your state, but if you're interested in getting involved you should start by speaking with your state marksmanship coordinator or whoever deals with forecasting ammunition at the state level. You can also follow up with the NGMTC about upcoming regional matches your state may be able to participate in.
I don't know the trainer side of it. I went to SDM (squad designated marksman) at CAmp robinson, in Little Rock. Best school ive ever been to, well besides small arms master gunner course. I will tell you where you can find some of the best marksmanship instructors in the whole Army: The Pennsylvania Army national Guard
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