If we consider B-GL-300-001/FP-001 Land Operations to be the de facto "bible" for conducting land operations then:
2. Force Elements. Combat, combat support, combat service support, and command
support are the possible elements of a land force. The proportion of each element within a
specific land force will be task-tailored and therefore will vary for different operations:
a. Combat Elements. Combat (cbt) elements consist of those elements that
engage the enemy directly. They fight and typically employ direct fire weapons
and manoeuvre, and include armour, infantry, and direct fire units. They are
considered ground manoeuvre forces.
b. Combat Support Elements. Combat support (cbt sp) elements consist of
those elements that provide fire support, operational assistance, and enablers to
combat elements through designated command and control and fire support
relationships. Cbt sp elements include fire support, air defence,
reconnaissance, combat engineer, some electronic warfare elements, and some
aviation assets. They may be referred to as simply support elements.
c. Combat Service Support Elements. Combat service support (CSS) elements
primarily provide administration and logistics support to Cbt or Cbt Sp elements.
CSS elements include log, HSS, LEM, and PSS. Force support engineers that
normally provide water, electrical power, infrastructure, and main supply route
(MSR) maintenance are classified as CSS elements.
d. Command Support Elements. Command support (Comd Sp) elements assist
commanders in the exercise of command. It includes staff of all types,
communications, intelligence, information systems, and other elements
assigned to protect, sustain, and move the commander or the headquarters.
They include signals and headquarters organizations.
Regardless, like I said, just clarifying OP intent.