The Abrams tanks that the United States intends to transfer to Ukraine are the modern M1A2, not the A1, which the US military has in stock, but they will also be stripped of their so-called secret armour, which includes depleted uranium.
U.S. Plans to Send Abrams Tanks to Ukraine, Officials Say - The New York Times
In focus: Battle tanks for Ukraine – DW – 01/24/2023
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US finalizing plans to send approximately 30 Abrams tanks to Ukraine, two US officials say
Pentagon looks to shift dynamic in Ukraine war, without Abrams tanks – Euractiv
U.S. Abrams Tanks Have Radioactive Armor, But Ukraine Won't Get It
Biden Announces Abrams Tanks to be Delivered to Ukraine > U.S. Department of Defense > Defense Department News
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Ukrainian soldiers heartened by delivery of U.S. Abrams tanks
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US Sending Ukraine 31 M1 Abrams Tanks to Help Fight Russia – NBC New York
US will send Ukraine more advanced Abrams tanks, but without secret armour
Tanks a Lot (Well, Actually Not That Many for Ukraine) - Foreign Policy Research Institute