Once knew an OCA who was also Capt of crew 7
When he left the Sqn he was presented with 2 dart-boards and 8 darts
One board and 1 dart for detachments - all the numbers were "7"
The other, plus 7 darts - for Trg, SAR, OPS and duty crew
His "favourite" crew of the month could feature about 5 times on this board
Not sure what happened if he hit a treble
Hit and miss planning! Seems to work - Who needs computers?