These guys are common in the sanctuary area. They arent aggressive unless you aggro them or aggro the scouts that fly overhead. They attack wild aggressive dinos so they can help for early game survival. They also drop good stuff like oil, crystal, scrap metal and electronics.
When you have an Enforcer and level him up he can carry quite some weight, has a lot of health (though you shoulden't try to kill anything higher than a corrupted Rex),and he can do a lot of damage. You can even build your fort up high and jump down with him 'cause he has no fall damage.