This allows an extremely short cooldown time for Adrenaline Burst to be obtained. However I would recommend that you max Assault Training and take the Shock Trooper specialisation. On top of this you don't seem too pushed regarding the class passive. I see that you're only taking Assault Training and until Armour is unlocked.

It adds so much to a character's durability and one can become essentially invincible to anything except splash damage and melee. Maxed out and with an adequate amp, a permanent barrier can be obtained. I would advise that Barrier be given max priority during this Vanguard playthrough.