[kcdusk]

The Players Handbook page 5/6 gives the CUF formula as ((months in combat) / 10 + D6) - 10.

So each 10 months your CUF could decrease by 1 as per the formula.

Or each 10 months you could take your time in combat divide by 10 (same as above, you should have improved by 1) and re-roll the D6. If CUF goes down you've improved over time. If CUF goes up then your PC is getting old, the shakes, and loosing his edge.

I'd say 10 months is too long however, and maybe do it each month or 10 firefights or whatever suits.

I have no problem with a CUF getting worse. The idea only just occurred to me. But you often see characters loose their edge, become unreliable etc and i think its a great possibility.

Even offer the PCs a choice. Roll the D6 and perhaps improve CUF ... or maybe take a step backwards.