The US has carried out a second flight test of a newly upgraded nuclear free-fall bomb in five months at the Tonopah Test Range in the state of Nevada which it says is designed to “meet national security requirements.” The test of the B61-12 bomb, which was the second of the upgraded B-61 variant, was dropped by an F-15E Fighting Falcon jet on August 8. The second qualification flight test for the nuclear weapon was completed by the US Air Force and the National Nuclear Security Administration (NNSA), with the first one having been successfully conducted in March.