Ah, the AIM9 coolant issue. No, you don't fly around with them cooled the entire time in an operational environment. It won't last. The U.S. missiles are different to the European models. Internal Argon canister in the U.S. models, short duration, but rapid cooling. Euro versions, nitrogen bottle in the launcher, lasts longer, takes longer to cool. If you select coolant on at 'commit' they will be ready when you need them. The X uses a cryogenic cooling system and is very different. That is in very rough and deliberately non-committal terms.