[Semper911]

Why don't they just hire them as private contractors? The DOD could still provide the training and benefit from their services. I see no need for linguists to be soldiers, if they are just used for document translations.

[El Gato]

if they are just used for document translations.

But hey aren't. They monitor intercepted radio transmissions, interpret for commanders dealing with the locals, and translate captured documents. All of which must be done "on site" as it were. On site being at least nearby where the bullets are flying and the motor shells and rockets are falling.