Navy E-4/5/6 Machinist's Mate Rating Badges Rating Badge Type:Blue Serge Air Force as a separate

Air Force as a separate branch of service in 1947

Criteria: Worn by Intelligence Specialists (IS) with ranks from Petty Officer 3rd Class (E-4) to Petty Officer 1st Class (E-6)

while considered a separate award

United States Navy Chief Petty Officer Identification Badge

Abbreviation: PARRIGBD

Navy E-4/5/6 Machinist's Mate Rating Badges Rating Badge Type:Blue Serge Air Force as a separateUnited States Navy E 4 5 6 Machinist's Mate Rating Badge Criteria: Worn by Machinist's Mates (MM) with ranks from Petty Officer 3rd Class (E 4) to Petty Officer 1st Class (E 6). Machinist's Mates are typically responsible for the continuous operation of the engines, compressors, refrigeration and air conditioning equipment aboard the USN's vessels and at their land based installations. Some Machinist's Mates are also trained in Health Physics and