Shipment of M109A6 "Paladin" howitzers to Ukraine

Question is: which army - crews will operate the Howitzers, as Ukraine have no trained crews?
And for crew to be properly trained to use M109A6 is needed at least half of year of training .
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Shipment of M109A6 "Paladin" howitzers . On train composition is also seen an M992 ammunition carriers.
M109A6 Paladin is in service with only 3 customers
-United States: 992
-Saudi Arabia: 177
-Republic of China (Taiwan): 40