what is the difference between officer and warrant officer
First, officers outrank warrant officers who out rank noncomissioned officers. Generally, officers serve in leadership positions while warrant officers serve in position where advanced technical knowledge is needed. In Aviation units there will be a lot of warrant officers between the ranks of WO 1 and WO 4. You will see maintenance warrant officers usually in Ordnance units and certain units which have complex equipment such as in Construction Battalions. Many of the medical PA's will be warrant officers.