Main battle tanks are heavier and more powerful than infantry fighting vehicles, which Ukraine currently uses or will soon receive. They are designed to destroy other tanks and break through enemy lines. Their tracks are built for movement across open terrain, similar to the landscape of eastern Ukraine. The Pentagon wants to speed up the delivery of Abrams tanks to Ukraine and has decided to send a refurbished older model that can be ready more quickly. The Abrams tanks that the United States intends to provide to Ukraine are modern M1A2s, not the A1s that are in storage with the US military, but they will also be stripped of the so-called secret armor that contains depleted uranium.