Novel Protection Against Potential Brain, Hearing and Vision Injury During Blast Wave Exposure

Inclusion Criteria: * Normal healthy volunteer * Able to provide written consent Exclusion Criteria: * Unable to provide written consent * History of neurological deficits, previous cerebral infarction, or severe head trauma as indicated through pre-tactical training screening: * Medical contraindications to restriction of venous outflow via the internal jugular veins (known increased intracerebral pressure, metabolic acidosis or alkalosis) * Glaucoma (Narrow Angle or Normal Tension) * Hydrocephalus * Recent penetrating brain trauma (within 6 months) * Known carotid hypersensitivity * Known increased intracranial pressure * Central vein thrombosis * Any known airway obstruction * Any known seizure disorder