Pawel
First - a question. Why doesn't the LAV-25 have a nice M-number like all the other US military vehicles?
Well, until 1947, there was a War Department, and a Navy Department, and ne'er the twain doth meet but in Congressional arguments about budget.
Even now, under the (allegedly) unified Department of Defense, Vehicles produced solely for the Navy Department do not get "M" numbers. This is because those "M" numbers come from the Army's (DLA's per The Book) Classification/Inventory system. The materiel gets an NSN (National Stock Number) because GSA (General Services [national government] Administration) requires them for auditing.