LSAT

The LSAT Light Machine Gun, of the LSAT (Lightweight Small Arms Technologies) program, is a developmental light machine gun. The LMG provides a major reduction in weight over legacy weapons, as well as improvements in other areas, such as controllability and reliability. As of 2008, it has two configurations, one that fires polymer-cased ammunition, and one that fires caseless ammunition. The one in Battlefield 3 fires cased ammunition.

Battlefield 3
The LSAT can be seen in the killfeed in the Battlefield 3: Close Quarters Gameplay Trailer.

To obtain the LSAT, players must complete the "Point Blank" assignment. The requirements for this assignments are:
 * 10 kills with C4
 * 10 knife takedowns