Designated Marksman. military marksman role in a U.S. infantry squad. The DM's role is to supply rapid accurate fire on enemy targets at ranges up to 870 yds with a highly-accurate semi-automatic rifle equipped with a telescopic sight. Like snipers,
DMs are trained in quick and precise shooting, but unlike the more specialised "
true"
sniper, they are also intended to lay down accurate rapid fire.