Diagnosis. Your doctor can often diagnose dehydration on the basis of physical signs and symptoms. If you're dehydrated, you're also likely to have low blood pressure, especially when moving from a lying to a standing position, a faster than normal heart rate and reduced blood flow to your extremities.
A Corporal is a noncommissioned officer, whereas a Specialist is not. Unlike other NCO ranks (such as Sergeant, Staff Sergeant, etc.), promotions to Corporal don't have to be DA approved (although they can be), since it's considered a lateral promotion, with no changes made to pay.
Report Abuse. Specialist is simply an Army rank, a pay grade of E-4. If you're pen pals, this would be a great question as to what he specializes in! Source(s): http://www.defenselink.mil/specials/insi...