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Mobile Arsenal is a Specialization featured in Battlefield 1 for the Support kit. After being tested in the game's Community Test Environment, it was intended to be introduced alongside eight other specializations with the Turning Tides update, but was held back from being implemented due to player feedback. Along with Medic's Aura, it is unknown if the specialization will re-enter the game in a revised form, or has been scrapped entirely. 
The specialization allows a player, playing as a Support with the Ammo Crate equipped, to resupply teammates in a circle around them without having to actually deploy the crate itself. The effect is nullified if the player using the specialization gets suppressed.