I think that BEagle has probably got to the heart of the issue, the costs involved in generating a CAT III capability and maintaining it for the few days a year when it may be needed are simply not warranted. It is not a matter of just putting in an uprated ground installation, the aircraft themselves need to have the capability and reliabilty and technical history to carry out the approach to CAT III, the crews have to be qualified, practiced and current, and the required ground procedures need to be adopted. The costs and risks are just not worth it for a military operation in peacetime.