Many suits in Gundam Battle Operation have access to vulcan cannons. Vulcans are both weak and have low accuracy, but they have the ability to be able to keep checks and balances on enemy infantry. Because the size of the bullets are small and the spread of fire is not too wide at close range, these weapons make themselves useful for being able to reliably kill infantry.r. Explosives are by far the best way to take care of enemy infantry on the ground, but they are not reliable for killing targets that have taken to the air. Vulcans are more versatile in that they can kill ground and air targets with more ease. If your suit doesnt not have explosive weapons to take out infantry, use vulcans, if you dont have vulcans you will have to try to use your melee weapon which is very unreliable.