The Wolf Enforcer is another unit of the Silver Wolves, released in the 2.0 Patch. He carries a gun that seems to closely resemble an AK-47 and has two types of attacks. The former is a single shot that does high damage with an increased chance for a critical. The latter fires four rounds with reduced accuracy, but potential for more overall damage.
What makes the Enforcer threatening is that each attack has its own ammo supply and cooldown, so he can alternate fire between the two weapons, effectively attacking every turn until he expends the ammo on one of his attacks (more likely the "Controlled Burst" option). However, it is not very effective against heavily armored units like Heavy Tank or Super Tank.
If your tank armor runs out or you are using high-dodge/defense units with low health as front-line fodder, this should be your top priority.
The strongest version of this unit is the Silver Wolf Judge. You will begin to encounter it at level 55.