Well, if I had ever got off my ar$e and done the relevant reading, writing, licking and crawling courses which grease the passage of promotion to become a staish, I would have summoned OC Admin into the office and invited him/her to toss a coin....
"What for?" he/she would have asked....
"The winner gets to choose whether to do Christmas or Boxing Day SDO, the loser will do the other. Questions on that, OC A?" would have been the reply.
Volunteered for several Christmas Incirliks over the years. One Stn Cdr personally wrote everyone an individual card, he knew his people. Another sent the same card to everyone - he didn't know his ar$e from his elbow.