[Matthew Oxford]

Military

As a military led expedition, the majority of the information below relates to the US military; for other militaries check out the comparative military ranks page on Wikipedia. For civilian ranks, refer to the civilian rank structure in the Knowledge Database. Big thanks to Lieutenant Colonel Robert Walker for all the information he contributed to this page.

Enlisted Personnel

Pay Grade	Rank	Approximate Age	Percentage in Rank
E-1	Airman Basic	<22	4.7%
E-2	Airman	<22	4.4%
E-3	Airman First Class	<22	18.3%
E-4	Senior Airman	<22	18.4%
E-5	Staff Sergeant	21-24	25.0%
E-6	Technical Sergeant	25-29	15.2%
E-7	Master Sergeant	30-34	10.8%
E-8	Senior Master Sergeant	35-40	2.0%
E-9	Chief Master Sergeant	40-50	1.0%

Warrant Officers

Pay Grade	Rank
W-1	Warrant Officer
W-2	Chief Warrant Officer Two
W-3	Chief Warrant Officer Three
W-4	Chief Warrant Officer Four
W-5	Chief Warrant Officer Five

Commissioned Officers

Pay Grade	Rank	Approximate Age	Percentage in Rank
O-1	Second Lieutenant	<;21	14.1%
O-2	First Lieutenant	23-25	11.8%
O-3	Captain	26-30	32.2%
O-4	Major	31-35	22.1%
O-5	Lieutenant Colonel	35-40	14.9%
O-6	Colonel	40-45	5.4%
O-7	Brigadier General	45+	0.2%
O-8	Major General	50+	0.1%
O-9	Lieutenant General	55+	0.05%
O-10	General	60+	0.01%

Full credit to Stargate: Delta. Many thanks to Henry Pratt  for his permission to use the information posted here.

original post found here.