Aside from these two changes, the M17A1 and M17A2 remained structurally identical. In addition to the deletion of the resuscitation tube, a size extra small (XS) was added. The resuscitation tube was eventually phased out, with the standardization of the M17A2 in 1983. While the idea of performing CPR between two masked soldiers was novel, the resuscitation tube that was issued with the M17A1 proved to be complicated and often jeopardized the integrity of the mask's airtight seal. The ability to consume liquids while wearing a gas mask soon became a standard once it was established that it could be done. The straw could be moved toward the wearer's lips via a small knob on the front of the mask (see below right). The canteen could then be inverted so that the thirsty soldier could suck water in via an angled straw on the inside of the mask. The M17A1's drinking device was a smart mechanism that allowed a canteen to be attached to a tube outside the mask. In 1966, the M17 was upgraded to the M17A1 after the addition of optical insert supports, a drinking device and a resuscitation tube. symbol molded into the front of the mask (see below left). The early version of the M17 (above left) is possibly a prototype, considering the date stamp of 1958 and the presence of the C.W.S. The first prototypes of the M17 were made in the late 1950s, and the M17 was standardized in 1959. The M17 was copied by at least 4 countries, possibly more. Despite this problem, the M17 was just as successful as it's predecessor, the M9A1. This is one of the key factors that lead to the replacing of the M17A2 series masks in the early 1990s. To swap filters the wearer had to remove the mask and perform the rather difficult and time consuming task of both extracting the spent filters and inserting fresh ones. The one major drawback however, was that the two internal filter elements were not easily exchanged in the field. This feature eliminated certain difficulties with head mobility and also enabled both right and left handed weapon sighting. "This mask was the first to incorporate dual filter elements housed in two bilateral cheek pockets. The 190th is located at Forbes Field in Topeka. History of Object: Donor served as an aerial refueling (boom) operator with the Kansas Air National Guard 190th Air Refueling Wing during Operation Desert Shield and Operation Desert Storm. A smaller strap is attached at center of bag (small ring below) and clips above this. One large strap is attached at bottom left edge and clips top right edge. There is another two snapped incorporated pocket to the left of the this. A snap pocket, located on the bottom of the bag contains a plastic bag with a waterproofing plastic sheet (folded). Top edge double folds and secures with two metal snaps. Bag is somewhat square in shape with rounded, irregular bottom. Drab green canvas carrying bag for gas mask.
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