Ready up. Speeds up engagement
Marathon. Gain ground.
Dead Silence. You don't want the static players hear you coming or they will prepare for you.
Sit-Rep. CQC means you'll be running into alot of equipment. Spot IEDs/IMS before it stops you. Spot player location. Destroy player equipment - save your team-mates and gain +1 to your killstreak.
Amplify. If you're pushing into their territory this helps protect your rear.
Steady Aim or Agility. I use either. SMG hip-fire is good as is but sometimes i prefer the extra accuracy so i can hip-fire in certain scenarios and kill just as quick. Agility is good at making you harder to hit when you're running across areas where you are exposed and of course helping you to gain ground and exit areas quicker.
On the Vepr i stick a silencer and a grip. Oh and Ping is a really helpful perk when pushing, you could use it in place of Steady Aim/Agility.