I tried so hard to get him in Spec Ops. It’s really hard to do, but he is really worth it. He has it all, power, defense, Perks. Havok really changes matches. He gains Stamina all the time and that’s great because his attacks use a lot.
It’s too late now to get him, but he should be re-released later on to buy with Command Points. You don’t want to fight Havok. He can get rid of all your Perks with a single attack and destroy you with another. Highly recommended and watch out if you’re fighting him.