Deduction of rent for a private arrangement directly from a service person’s salary

Currently waiting for a response from Ministry of Defence, they should respond promptly and normally no later than (details).

Dear Ministry of Defence,

Is it possible for a private landlord or similar such party engaged in a private agreement for housing rental to have the rent deducted directly from a service person’s salary and reflected on their payslip?

If so, what mechanism exists to enact this?

If so, how many service personnel currently have such an arrangement in place?

Yours faithfully,

Ben Unsworth