Greetings... taHaiya Tayyiba wa b3ad...

Depending on the level of military command or headquarters involved, in this case a battalion (as cited in the original text), the equivalent term - as rendered in "U.S. Military English" - is:

"Section chiefs" (the heads of internal elements of one of the staff sections of a battalion, as cited).

Example: Battalion S-3, Operations and Training Staff

This staff normally includes these functional sections:

a. Planning section

b. Training managment section

c. Operations section

d. Fire support coordination (artillery direct support)

etc.

That term remain = "section chiefs" inside staff sections at higher levels of military command (such as those in a brigade, regiment, division , etc.).

Hope this helps.

Khair, in shaa' Allah.

Regards,

Stephen H. Franke
San Pedro, California