It may have been before Crab became a SARBOY but the fact is that once upon a time RAF SAR units didn't have an Ops Clerk. The duty crew were responsible for NOTAMS/CHADS/CALFS etc. When we went flying one of the ground crew used to man the Ops desk/radios/telephones etc. If you fly for 4 hours per shift there are still 20 hours remaining. What do you do with all that time?