It bothers me way more than it actually should. How is placing mines an "assault"? AT grenades? Sure it is. AT cannon? Well, it's actually both defensive and offensive. But mines? Mines are limpet charges being placed on the ground, why give them to Assault? They are also completely defensive tool which fits the Support role way better. And another thing that I would want sooo badly is that Support has additional "sapper" role. He sees stationary explosives as highlighted (mines, traps) and can defuse them. You know, he should protect these tanks from being blown up, why only by repair tool?