English: Department of Defense video shows U.S. stockpiles nuclear weapons up to 1961. The stockpile includes early airdrop fission weapons, Mark (Mk)-3, Mk-4, Mk-5, Mk-6, Mk-6/18, Mk-7, Mk-8, Mk-12, and Mark-9, the artillery atomic projectile. A live test of the Mk-9 fired from a 280mm cannon is shown. This was the 15-kiloton GRABLE test conducted on May 25, 1953, as part of Operation Upshot-Knothole. The narrator explains that the storage, maintenance, inspection and modification of nuclear weapons is part of the "mine to stockpile sequence." Also, the video shows that the technicians are a vital part of the "stockpile to target sequence" as they prepare weapons for shipment, load weapons onto strike aircraft, and maintain and modify weapons at forward field sites. Footage is shown of weapons being loaded on a B-52 and a smaller attack aircraft. The narrator explains that the major function of a technician was to "make the weapon ready for the day when by Presidential decree, nuclear weapons would be sent out on intercontinental bombers, tactical aircraft, missiles, and carrier-deployed aircraft to the target areas."