solocmv,
Military pilots are trained to be able to fly the aircraft in any weather conditions, as a singleton, or in formation, which is a core skill for military pilots - particularly for those flying fighters.
If you really want a bit of fun, night IMC formation followed by a bit of air-to-air refuelling always keeps you honest, and it's a great skill to have. The bad guys aren't always going to wait for Day VMC conditions when the ****e hits the fan....