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.
Definition of specialist for English Language Learners. : 1  a person who has special knowledge and skill relating to a particular job, area of study, etc. : 2  a doctor who deals with health problems that relate to a specific area of medicine. : 3  a rank in the U.S. Army that is above the rank of private and below the rank of corporal.