Have We Ever Asked for the Return of Howitzer Shells? Would We Know How?

I have read in the news media that the U.S. has already supplied Ukraine with over two million howitzer rounds, but they continue to need more at the rate of seven, or eight, or nine thousand rounds a day (numbers vary depending upon the particular source you read). 

Are they really firing that many? Are some being diverted elsewhere?  

The Ukraine howitzer business has put me in mind of a scene in a very good although overlooked movie about the early years of our involvement in Vietnam. See the whole thing here: Go Tell the Spartans. 

The particular scene starts at 1:12:22 and runs to 1:15:45. In it, an American Major played by Burt Lancaster makes a subtle offer to oversupply a Vietnamese Colonel with howitzer shells in return for his artillery support to an American outpost under siege. 

He pitches an immediate air supply of 500 rounds from an American depot, followed by 1,000 more to be delivered later by truck convoy. 

[Vietnamese official seeing an opportunity]

It would take four or five days for the truck convoy to bring the shells from the American depot. That could conceivably be too late for their use could it not, major?

[Burt Lancaster]

Could be.

[Official]

In such a case, the American depot would desire the return of the shells, would it not?

[Lancaster, astonished]

In the whole history of the United States they've never asked for the return of anything, be it guns, money, boats, or howitzer shells. They wouldn't know how to ask for the return of anything. If they did, it would screw up the bookkeeping and everybody in Washington would have a goddamn nervous breakdown.

You tell the colonel if he gets his hands on the ammo, it's his forever.

Has anything really changed other than the sheer numbers of rounds involved?