Be the Bullet

From Halopedia, the Halo wiki

HR Medal Be the Bullet!.png

Be the Bullet! is a spree medal in Halo: Reach Multiplayer, Campaign and Firefight. It is awarded for killing fifteen opponents with a Sniper Rifle without dying.

Note that you don't have to get fifteen sniper headshots in a row, just fifteen kills with a sniper rifle. Melees with the sniper rifle do not count toward the medal.

It is represented by a silver six-pointed star with purple crosshairs in the middle.