Tissue valves are recommended for patients who: Cannot or will not take blood thinners. Are younger than 65 years old and need aortic valve replacement but do not have risk factors for blocked valves or who are younger than 70 years old and need mitral valve replacement.
UW is defined in Training Circular 18-01, Special Forces Unconventional Warfare, as activities conducted to enable a resistance movement or insurgency to coerce, disrupt, or overthrow a government or occupying power by operating through or with an underground, auxiliary, and guerrilla force in a denied area.
U.S. Army Special Forces soldiers from the 3rd Special Forces Group patrol a field in the Gulistan district of Farah, Afghanistan. The primary mission of the Army Special Forces is to train and lead unconventional warfare (UW) forces, or a clandestine guerrilla force in an occupied nation.