In the early days of the C-130J, Navigation Light bulbs were regularly robbed, until robs were stopped, it didn't stop them cannibalising them after that.
When replacement items came, they consisted of the entire mount and bulb, as you could not just demand the bulb. All the DF's did, was put the new bulb in the aircraft and put the new fitting in the bin. No wonder money disappears from the defence kitty.