Field army 集团军
![The standard map symbol for a field army. The four exes are the generic symbol of a field army (i.e. they do not represent Roman numerals); the army's specific number or name, if included, would be written numerically to the left of the symbol.](/Images/godic/202501/13/Army_Nato2628.png")
![The unit flag of the Sixth United States Army. The distinguishing flag of a United States army is bicolored, white over red, measuring 91.4 centimeters (36 inches) hoist by 121.9 centimeters (48 inches) fly, with gold fringe. In the center is a rendering of the army's shoulder-sleeve insignia, measuring 38.1 centimeters (15 inches) in height.[1]](/Images/godic/202501/13/Sixth_United_States_Army_flag2628.gif")
![](/Images/godic/202501/13/Latvian_platoon_at_Camp_Lejune2628.jpg")
![Estructura básica de un ejército. El número de componentes es variable según país, época y circunstancias.](/Images/godic/202501/13/Estructura_Ejercito2628.PNG")
A field army (or numbered army or simply army) is a military formation in many armed forces, composed of two or more corps and may be subordinate to an army group. Likewise, air armies are equivalent formation within some air forces. A field army is composed of 100,000 to 150,000 troops.