As one of the guys at the Division level that used to review every report of a lost weapon or high value item, I can all but assure you, your unit, be it troop, Bn, BDE lost many items, as or more concerning than a Weapon most cant feed to any extent, or a 32 rounds of ammo, that cant be fired from any weapon other then a MK19.
If you would like to give me the UIC for every unit you were in, Id be happy to post up the lost weapons, NVG's, Radios, GPS, AN/CYZ-10 Data Transfer Device, ANCD Data Transfer Device, other COMSEC equipment lost, or found installation property attributed to those UIC's BDE and below.
My point it, it happens, it shouldn't, but it does, to even the best units. Because they are made up of humans, and humans make mistakes, have a lapse of attention, judgement, become thieves, ect.
Its wrong, the AF lost track of a 240, its a lot less concerning to me than if they had lost a M9, or M4.
Its wrong the AF lost a can of MK19 40mm Training Practice rounds, Id be more concerned if they had lost a single round of 9mm ammo, which is to say, I'm not concerned at all.