Chemical weapons in World War I volatile oily liquid. It was introduced as a vesicant by Germany in July 1917 prior to the Third Battle of Ypres. The Germans marked their shells yellow for mustard gas and green for chlorine and phosgene; hence they called the new gas "Yellow Cross". It was known to the British as "HS" ("Hun Stuff"), and the French called it "Yperite" (named after Ypres). Mustard gas is not an effective killing agent (though in high enough doses it is fatal) but can be used to harass and disable the enemy and pollute the battlefield. Delivered in artillery shells, mustard gas was
History of the German Army Aviation Corps helicopters. The Mil Mi-24 fleet, however, was no longer used and subsequently sold off. In 1991, German Army Aviation Corps helicopters provided humanitarian aid to Kurdish refugees in northern Iraq. From October 1991 onwards, Sikorsky CH-53G of the German Army Aviation Corps provided the means of transport for UN weapons inspectors in Iraq. In 1993 and 1994, in Somalia, Bell UH-1D helicopters equipped with machine-guns were used for the first time in earnest as a means for self-protection. On 1 April 1994, the German Army Aviation Corps Brigade 10 was established. This brigade united all German Army Aviation Corps transport