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2. Training masks - Wikipedia

   en.wikipedia.org/wiki/Training_masks

   Training masks are facial masks worn to limit the intake of air during breathing. Their ostensible purpose is to strengthen the respiratory musculature by making it work harder. There is some evidence that they may improve endurance capacity ( VO 2 max ) and power output, but research into their benefits has so far generally proven inconclusive.

3. Joint Service General Purpose Mask M-50/M-51 - Wikipedia

   en.wikipedia.org/wiki/Joint_Service_General...

   The mask was designed to incorporate state-of-the-art technology to protect soldiers from current and anticipated threats from all types of weapons of mass destruction. It is an above-the-neck, chemical - biological (CB) respirator that protects against battlefield concentrations of CB agents, toxins , toxic industrial materials, and ...

4. MOPP (protective gear) - Wikipedia

   en.wikipedia.org/wiki/MOPP_(protective_gear)

   U.S. Marines in MOPP 4 gear during the 2003 invasion of Iraq U.S. Army soldiers test MOPP 4 gear at the Yuma Proving Ground's Tropic Regions Test Center in Hawaii. MOPP (an acronym for "Mission Oriented Protective Posture"; pronounced "mop") is protective gear used by U.S. military personnel in a toxic environment, e.g., during a chemical, biological, radiological, or nuclear strike:

5. California climbers train for Mt. Everest from the comfort of ...

   www.aol.com/news/california-climbers-train-mt...

   Graham Cooper exercises while wearing a training mask that simulates the low oxygen levels at high altitudes on Mt. Everest. ... Cooper has spent his training days in Tahoe on back-country skis ...

6. Respirator fit test - Wikipedia

   en.wikipedia.org/wiki/Respirator_fit_test

   F.H. Varley painting depicts a training exercise in Seaford, England. Soldiers emerge from a gas hut wearing respirators. A respirator fit test checks whether a respirator properly fits the face of someone who wears it. The fitting characteristic of a respirator is the ability of the mask to separate a worker's respiratory system from ambient air.

7. M17 gas mask - Wikipedia

   en.wikipedia.org/wiki/M17_gas_mask

   The mask offers protection from chemical and biological warfare agents, but does not function properly in places where oxygen content is low. [1] The mask is not meant to be used for firefighting and does not provide protection from radiation, however the filters will stop irradiated particles from entering the respiratory system of the wearer ...