I guess they are what we now commonly call, “the point of the spear”. I recall Churchill seeing that the Russians had a 9 to 1 ratio of fighters to support troops. He recalled that Montgomery had just about the exact opposite.
Still as Patton once said, an Army is a team and everyone is important, from the guy who washes the pans to keep the soldiers from getting sick to the combat soldiers. They all have to perform.
Interesting footnote: George Patton, grandson of a Confederate officer and a Southerner by birth and temperament,without hesitation integrated his Third army units to maintain combat efficiency.