The triple turreted castle has been in use by the Corps of Engineers since it was adopted in 1840. Prior to that time an insignia of a similar design was worn on the uniforms of the Corps of Cadets of the United States Military Academy since the Academy was under the supervision and direction of the Chief of Engineers.
The most common cause of energy crisis is a drop of cerebral perfusion (global ischemia), usually resulting from cardiac arrest or severe hypotension (shock). Sustained severe hypoglycemia, and seizures lasting 1-2 hours also cause permanent brain damage. Pure hypoxia in clinical settings is unusual.
ischemia - local anemia in a given body part sometimes resulting from vasoconstriction or thrombosis or embolism. ischaemia. ischaemic stroke, ischemic stroke - the most common kind of stroke; caused by an interruption in the flow of blood to the brain (as from a clot blocking a blood vessel) TIA, transient ischemic attack - brief episode in which the brain gets insufficient blood supply; symptoms depend on the site of the blockage.