My CO, lawd bless 'a, recently sent me a letter congratulating me on not fecking up on a course, to which I was very much appreciative. However, I'm not sure as to the protocol of whether I should write back. I know it would be polite to acknowledge the letter, but I'm not sure if I'll get an earful of RSM for wasting the esteemed Lt Col's time. Any helpful thoughts? Or am I just being daft?