The Army has obtained a license to possess depleted uranium at its Pohakuloa Training Area on the Big Island and for Schofield Barracks on Oahu.
The license was granted Wednesday by the Nuclear Regulatory Commission.
The Army Garrison-Hawaii website says the military between 1960 and 1968 used 8-by-1-inch spotting rounds containing 6.7 ounces of depleted uranium alloy to identify the flight path of Davy Crockett warheads.
The weakly radioactive alloy was added to add weight to the spotting rounds.
Fragments were discovered six years ago.
The Hawaii Tribune-Herald reports the license requires the Army to follow a radiation safety plan for the installations.
Peace activist Jim Albertini says live fire should be stopped at Pohakuloa and all depleted uranium should be cleaned up.