Obtaining National and Secure Homeland Operations for Rare Earth Manufacturing Act or the ONSHORE Manufacturing Act This bill sets forth provisions to support secure supply chains of rare earth elements. A rare earth element means a natural element associated with (1) the metallic element scandium, with atomic number 21; (2) the metallic element yttrium, with atomic number 39; or (3) any of the series of 15 metallic elements between lanthanum, with atomic number 57, and lutetium, with atomic number 71, on the periodic table.