We developed a heavy breast plate with thigh guards, weighing 27 pounds, which stopped machine gun bullets at 150 yards. An experimental lot of these were completed in 26 days by the Mullins Manufacturing Co., of Salem, Ohio. These were also shipped abroad for test. A few defenses for arms and legs were prepared which, although light in weight, would protect the wearer from an automatic-pistol ball at 10 feet. About 70 per cent of the hospital cases in France were casualties caused by wounds in the arms and legs. These defenses, however, were rejected on account of their impeding to a certain degree the movements of the wearer. Our development in armor also produced an aviator's chair weighing 60 pounds. It would protect the pilot from injury from below and from the back, withstanding armor-piercing bullets fired at a distance of 50 yards. Since the piercing of the gas mask canister by a bullet might result in the death of the soldier by admitting gas directly into the breathing system of his mask, the Ordnance Department designed an armored haversack for the gas mask and its canister, this haversack incidentally serving as a breast defense. BAYONETS AND TRENCH KNIVES. Another large ordnance operation was the production of bayonets for the service rifles. The British bayonet had proved to be highly satisfactory in the war; and, since it was already designed to fit the Enfield rifle, which we had adopted for our own, we took the British bayonet as it was and, with only one slight alteration, set out to produce it in this country. The Government found both the Remington Arms-Union Metallic Cartridge Co. at its Bridgeport, Conn., works, and the Winchester Repeating Arms Co. building these bayonets for the English Government. The latter's bayonet needs by 1917 were being well supplied by home manufacture, and this permitted us to buy approximately 545,500 bayonets which had already been manufactured for the British. The Ordnance Department at once started out these two concerns on contracts for bayonets for the American Government, Remington with total orders for 2,820,803 bayonets and Winchester with orders for 672,500. Remington delivered in all 1,565,644 bayonets and Winchester 395,894. This was a total of 1,961,500 bayonets. The total production of 1917 rifles was about 2,520,000. These figures indicate that we were short over 500,000 bayonets at the time hostilities ceased; and as a matter of fact this shortage had already become acute, especially in the training camps.