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APP-6A Symbol	Name	No. of personnel	No. of subordinate units	Unit leader
XXXXXX	region or theater or front	200,000 +	2+ army groups	general or army general or field marshal
XXXXX	army group	100,000 +	2+ armies	general or army general or field marshal
XXXX	army	50,000-60,000+	2+ corps	colonel general or general or army general
XXX	corps	30,000-50,000+	2+ divisions	lieutenant general
XX	division	10,000–20,000	2-4 brigades or regiments	major general
X	brigade	3000–5000	2+ regiments or 3–6 battalions or Commonwealth regiments	brigadier general, brigadier or colonel
III	regiment or group	2000–3000	2+ battalions or U.S. Cavalry squadrons	colonel
II	battalion, U.S. Cavalry squadron or Commonwealth regiment	300–1000	2–6 companies, batteries, U.S. Cavalry troops, or Commonwealth squadrons	lieutenant colonel
I	company, artillery battery, U.S. Cavalry troop or Commonwealth squadron	70–250	2–8 platoons or Commonwealth troops	chief warrant officer and captain or major
•••	platoon or Commonwealth troop	25–60	2+ squads, sections, or vehicles	warrant officer and first or second lieutenant
••	section or patrol	8–12	2+ fireteams	corporal to staff sergeant
•	squad or crew	8–16	2+ fireteams or 1+ cell	corporal to staff sergeant
Ø	fireteam	4–5	n/a	lance corporal to sergeant
Ø	fire and maneuver team	2	n/a	any/Private First Class

US DoD Pay Grade	O-10		O-9	O-8	O-7	O-6	O-5	O-4	O-3	O-2	O-1
Insignia
Title	General of the Army	General	Lieutenant General	Major General	Brigadier General	Colonel	Lieutenant Colonel	Major	Captain	First Lieutenant	Second Lieutenant
Abbreviation	GA	GEN	LTG	MG	BG	COL	LTC	MAJ	CPT	1LT	2LT
NATO Code	OF-10	OF-9	OF-8	OF-7	OF-6	OF-5	OF-4	OF-3	OF-2	OF-1

U.S. DoD Pay Grade	E-9			E-8		E-7	E-6	E-5	E-4		E-3	E-2	E-1
Insignia													No Insignia
Title	Sergeant Major of the Army	Command Sergeant Major	Sergeant Major	First Sergeant	Master Sergeant	Sergeant First Class	Staff Sergeant	Sergeant	Corporal	Specialist	Private First Class	Private	Private
Abbreviation	SMA	CSM	SGM	1SG	MSG	SFC	SSG	SGT	CPL	SPC ²	PFC	PV2 ¹	PV1 ¹
NATO Code	OR-9	OR-9	OR-9	OR-8	OR-8	OR-7	OR-6	OR-5	OR-4	OR-4	OR-3	OR-2	OR-1
¹ PVT is also used as an abbreviation for both Private ranks when pay grade need not be distinguished ² SP4 is sometimes encountered as an abbreviation for Specialist. This is a holdover from when there were additional specialist ranks at higher pay grades.