My SiL is now a wg cdr. His route was Av Tech in REME with AAC. Commissioned in RAF thence OC CIS Eng, Corsham, IOT, MOD (no where near MB), thence a sqn ldr tour I can't recall, then wg cdr in AFG then in MOD, now at Shrivenham.
Each has compounded on his experience in previous roles and he is now seeking employment outside. Essentially variety over stability.