what does senior airman mean in the air force
Senior airman Senior Airman (SrA) is the fourth enlisted rank in the United States Air Force, just above Airman First Class and below Staff Sergeant. It has a pay grade of E-4. Between its approval on 30 December 1975 (with implementation 1 June 1976) and 19 March 1991, Senior Airmen wore sleeve chevrons with blue center stars instead of silver to distinguish them from the non-commissioned officer rank of "Sergeant", also a pay grade of E-4. The latter was abolished in 1991 and the blue center star was changed to white to conform to all enlisted rank chevrons.
Single user mode Unix-like operating systems provide single user mode functionality either through the System V-style runlevels, BSD-style boot-loader options, or other boot-time options.
Religio The Latin term
Base oil The least refined type which produced by Solvent Refining. It usually consists of conventional petroleum base oils.