Designated Marksman Rifle. To put it bluntly, It's a sniper rifle.

The target locater,DMR[designated marksman rifle],plasma repeater and the plasma launcher!

G. L Willard has written:

'Manual of target practice for the United States Army' -- subject(s): Rifle practice, Target practice, United States, United States. Army

No, the M14 is not a sniper rifle, but a battle rifle. However, the M21 Sniper Weapon System, which has match grade ammunition, sights, and action, is derived from the M14. Today, the M14 is used by American armed forces as a designated marksman rifle.

Marksman