Staff duty officer.. Usually an nco that is put in charge while in absence of an officer. Like inspecting guard duty personell.. Smaller responsibilities.
We have met the enemy and have learned nothing more about him. I have, however, learned some things about myself. There are things men can do to one another that are sobering to the soul. It is one thing to reconcile these things with God, but another to square it with yourself. - Robert Leckie
Hi, I would suggest that your armlet is British and judging from the colours, red on black, the brass poppers and the style of the lettering, that is for wear by a senior RAF officer, usually in the rank of Squadron Leader whils acting a "Station Duty Officer" or on some units a "Senior Duty Officer"?? Both terms are used. For Warrant and Junior Officers, the armlet bears the initials "OO" (Orderly Officer.