Armor protection was improved by implementing a new special armor incorporating depleted uranium. This was introduced into the M1A1 production starting October 1988. This new armor increased effective armor particularly against kinetic energy rounds^[63] but at the expense of adding considerable weight to the tank, as depleted uranium is 1.7 times more dense than lead.^[64] The first M1A1 tanks to receive this upgrade were tanks stationed in Germany. US-based tank battalions participating in Operation Desert Storm received an emergency program to upgrade their tanks with depleted uranium armor immediately before the onset of the campaign. M1A2 tanks uniformly incorporate depleted uranium armor, and all M1A1 tanks in active service have been upgraded to this standard as well.^[65] This variant was designated as the M1A1HA (HA for Heavy Armor).^[8]

https://en.wikipedia.org/wiki/M1_Abrams

...Armor protection was improved by implementing a new special armor incorporating depleted uranium...

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