We even tried to Ozzie-ise the Huey on initial purchase - it came fitted with Tacan, but the Really Clever People in purchasing said "Nah, we don't want that, they are always out in the boonies, away from our 6 Tacan stations. Take it out."
So, we paid for it to be in the airframe initially, then paid for it to be taken out.
Oops, with that heavy set gone from the nose area, the CG is out. Let's put a lump of lead in to balance it up.
We then paid for a lump of lead to be fitted. Really useful, lead is. Much more use than a serviceable Tacan set.