With medical supplies being moved out of the main arsenal prefab and put into medic tents, I'd like to make the suggestion of creating a Heavy Ammunition category with the various heavier, vehicle-oriented ammunition types, similar to the mortar category implemented (Image 1), and moving these heavier ammunitions to the vehicle depots (Light, Heavy & Helipad) so that the various gun-cars and tin cans in the game can have a dedicated rearming station (Since the LAV25 Already uses the vehicle depots to rearm the gun and the Heli's have their rockets at Helipads).
This way, infantry can rummage a little easier through their arsenal and reduce the number of pages, and has the added benefit of not accidentally picking up a 250rd box for the PKM that infantry can't use, or the M60D belt-box for the M60 (Image 2).
The vehicle depot prefabs could also be modified to support a Repair section and a Rearm section, though not necessary (Image 3).
Alternatively, a new section specifically for heavy ordinance can be made on the rear of the arsenal bunker prefab, where mortars and previously stated heavy ammunition can be stored, since these ammo boxes don't purely exist for vehicles and are used by emplacements as well (Image 4).