I tagged medicine, repair and small guns.
I've now got them all at 100, as well as big guns and energy weapons.
On another point, Fawkes is awesome! But it sucks how late into the game he can join you.
Is this Halo heroic/legendary hard or operation flashpoint hard? E.g. quite difficult or soul-destroyingly difficult?
As ill get it on PC instead of Xbox 360 if its a particularly hardcore FPS.