<P> The chart below represents the current enlisted rank insignia of the United States Air Force . </P> <Table> <Tr> <Th> US DoD Pay grade </Th> <Th> E-1 </Th> <Th> E-2 </Th> <Th> E-3 </Th> <Th> E-4 </Th> <Th> E-5 </Th> <Th> E-6 </Th> <Th_colspan="2"> E-7 </Th> <Th_colspan="2"> E-8 </Th> <Th_colspan="4"> E-9 </Th> </Tr> <Tr> <Td> Insignia </Td> <Td> No Insignia </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Title </Td> <Td> Airman Basic </Td> <Td> Airman </Td> <Td> Airman First Class </Td> <Td> Senior Airman </Td> <Td> Staff Sergeant </Td> <Td> Technical Sergeant </Td> <Td_colspan="2"> Master Sergeant 1 </Td> <Td_colspan="2"> Senior Master Sergeant </Td> <Td_colspan="2"> Chief Master Sergeant </Td> <Td> Command Chief Master Sergeant </Td> <Td> Chief Master Sergeant of the Air Force </Td> </Tr> <Tr> <Td> Abbreviation </Td> <Td> AB </Td> <Td> Amn </Td> <Td> A1C </Td> <Td> SrA </Td> <Td> SSgt </Td> <Td> TSgt </Td> <Td_colspan="2"> MSgt </Td> <Td_colspan="2"> SMSgt </Td> <Td_colspan="2"> CMSgt </Td> <Td> CCM </Td> <Td> CMSAF </Td> </Tr> <Tr> <Td> NATO Code </Td> <Td> OR - 1 </Td> <Td> OR - 2 </Td> <Td> OR - 3 </Td> <Td> OR - 4 </Td> <Td> OR - 5 </Td> <Td> OR - 6 </Td> <Td_colspan="2"> OR - 7 </Td> <Td_colspan="2"> OR - 8 </Td> <Td_colspan="2"> OR - 9 </Td> <Td> OR - 9 </Td> <Td> OR - 9 </Td> </Tr> <Tr> <Td_colspan="15"> <Dl> <Dd> 1: The U.S. Air Force does not have a separate First Sergeant rank; it is instead a duty position denoted by a diamond within the upper field of the E-7 / MSgt, E-8 / SMSgt, E-9 / CMSgt paygrades / chevrons / ranks and is abbreviated "1st Sgt ." </Dd> </Dl> </Td> </Tr> </Table> <Tr> <Th> US DoD Pay grade </Th> <Th> E-1 </Th> <Th> E-2 </Th> <Th> E-3 </Th> <Th> E-4 </Th> <Th> E-5 </Th> <Th> E-6 </Th> <Th_colspan="2"> E-7 </Th> <Th_colspan="2"> E-8 </Th> <Th_colspan="4"> E-9 </Th> </Tr>

What is an e7 in the air force