The corps (figure 1-4) is essentially a large task force consisting of a variable
number of divisions and other combat and CS units, plus the CSS elements required for
sustained operations. It directs tactical operations and provides for the CSS of all
assigned and attached units. The corps has no fixed organization. Its organization
depends on the mission, availability of forces, terrain, climate, and probable hostile
forces. Included among "other combat units" are separate brigades and armored
cavalry squadrons allotted as determined by the theater commander. They may be used
as corps rear area security forces, as part of the reserve, or to augment the combat
power of the corps.
NOTE: Command structure of subordinate units is not rigid; that is; brigades
may be replaced by groups, depending on the magnitude of the mission.
Figure 1-4. Illustrative corps.
a. Corps headquarters has the means to control five divisions, more or less, and
the requisite CS and CSS to round out and sustain such a fighting force. Normally, the
next echelon above the corps in the operational chain of command will be a unified or
combined command headquarters. As shown in figure 1-1, the unified command
exercises operational command over the corps, while the theater Army headquarters
exercises command, less operational control, over Army units in the theater.