Keep in mind that you can score a boost during multiplayer matches by selecting one of these four Specializations:
Intervention: Specializes in offense and catching enemies off-guard. +25 XP and Credits when performing kill assists.
Front Line: Specializes in front-line combat. +50 XP and Credits for kills with grenades and other explosives.
Support: Specializes in dirty tactics and teamwork. +75 XP and Credits when accomplishing objectives.
Stealth: Specializes in taking out targets without being seen. +50 XP and Credits when performing headshot kills.