Table 1.

Descriptive Statistics on Demographics of Service Member Population, 1997–2015

Demographic variables	Strata	Mean	sd	Proportion of demographic variable (%)
Total population		1 382 266	30 987	100·0
Sex	Men	1 181 011	29 728	85·4
	Women	201 255	5378	14·6
Age group	<20 years	102 003	16 856	7·4
	20–24 years	447 211	23 715	32·4
	25–29 years	305 918	27 547	22·1
	30–34 years	210 145	13 502	15·2
	35–40 years	174 833	18 642	12·6
	>40 years	142 156	7758	10·3
Race	White	945 680	28 412	68·4
	Black	250 526	19 488	18·1
	Other	186 060	8247	13·5
Military Service	Army	506 209	31 422	36·6
	Navy	348 099	25 871	25·2
	Air Force	344 083	19 850	24·9
	Marine Corps	183 875	11 663	13·3