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.
Asymmetric warfare is war between belligerents whose relative military power differs significantly, or whose strategy or tactics differ significantly. This is typically a war between a standing, professional army and an insurgency or resistance movement. Asymmetric warfare can describe a conflict in which the resources of two belligerents differ in essence and in the struggle, interact and attempt to exploit each other's characteristic weaknesses. Such struggles often involve strategies and tact