The use of depleted uranium munitions has been fiercely debated, with opponents like the International Coalition to Ban Uranium Weapons saying there are dangerous health risks from ingesting or inhaling depleted uranium dust, including cancers and birth defects.
The alternative bring tungsten? It’s very stable so anything besides eating a spent rod isn’t going to have effects. If it’s in the air it’ll just be inert. Even if it gets in your lungs it’ll be like any other dust. DU on the other hand would keep emitting radiation internally.