No, I’m agreeing with it completely.
The concept of the “General Officer” in the West originates with the Captain-General, AND the rank/billet/posting/grade that in Anglophone armies is referred to as “General” with no qualifier, descends from the Colonel-General.
The job/rank titles of the USPHS, with corresponding Civil Service grades and such:
“Non-supervisory”
O-1:Junior Assistant Whatever/Ensign/GS-9
O-2:Assistant Whatever/Lietenant Junior Grade/GS-10
O-3:Senior Assistant Whatever/Lieutenant/GS-11
O-4:Full Whatever/Lietenant Commander/GS-12
“Mixed Supervisory and Non-supervisory”
O-5:Senior Whatever/Commander/GS-13,14
O-6:Whatever Director/Captain/GS 14,15
“Senior Supervisory”
O-7,8:Assistant Surgeon General/Rear Admiral(Lower Half)/SES
O-8: Deputy Surgeon General/Rear Admiral(Upper Half)/SES
These are temporary rank/grade/titles:
“Political”
O-9:Surgeon General/Vice Admiral/(Political Appointee, Temporary)
O-10:Assistant Secretary of Health Affairs or Something Like It/Admiral/(Political Appointee, Temporary)
NOAA also has a Navy style rank structure.
As for the topic at hand, the Air Force and Navy have most commonly contributed military personnel to the space program. I suspect that a “rank merge” will take place at some point in a new service…It depends on how you view the capital space ships … if you view them as big-ass carriers a la Space: Above and Beyond, you get a “Vacuum Navy.” If you view them as little air force bases that happen to move around, you get the air force structure…