Fun fact: "L" is also a DOE clearance level. Q is equal to DoD Top Secret, and L is equal to DoD Secret. Sauce - I needed a Q when I was an NRC Cyber Inspector so they reinvestigated/reinstated my expired DoD TS (the EQIP system is used for that and is far easier), and converted it to a Q. Most of the non-cyber people I worked with only had an L. All of the cyber inspectors had a Q.
Fun fact: "L" is also a DOE clearance level. Q is equal to DoD Top Secret, and L is equal to DoD Secret. Sauce - I needed a Q when I was an NRC Cyber Inspector so they reinvestigated/reinstated my expired DoD TS (the EQIP system is used for that and is far easier), and converted it to a Q. Most of the non-cyber people I worked with only had an L. All of the cyber inspectors had a Q.