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.
CORPORAL (CPL). Corporal is the base level of the Noncommissioned Officer (NCO) ranks. Corporals serve as team leader of the smallest Army units. Like Sergeants, they are responsible for individual training, personal appearance and cleanliness of Soldiers.ERGEANT MAJOR OF THE ARMY. There's only one Sergeant Major of the Army. The SMA oversees all Noncommissioned Officers. He serves as the senior enlisted advisor and consultant to the Chief of Staff of the Army (a four-star General).