Contingencies - no problem.
1. Write contingencies for every eventuality - lock in cupboard
2. Assume only X contingencies at a time requiring Y assets
3. Use existing forces for actual contingency, now upgraded to Operation, for contingency not considered an eventuality in #1
4. Hope and pray that #2 applies and #1 or #3 don't recur again.
A good example of wishful thinking pulling chestnuts out of the fire was GW1 and SH didn't foresee the end of the Cold War and the loss of sponsorship by the USSR.