I had my first formal interview with my recruitment advisor and am now booked onto an AOSB briefing in November. The meeting took several hours and was very helpful - I have subsequently received information from my regiments of choice, which clearly he has organized for me, as well as a personally signed letter reminding me of the arrangments for AOSB and some advice. I've been told that sending letters of thanks to senior officers whenever they take time out to help you should be responded to with a letter - is this true in this instance? I feel it would be polite and appreciative, but not sure if it would look a little overkill, bearing in mind I haven't been yet. Would sending a note saying something like, 'Thank you for meeting me, I found the meeting very useful and feel much more confident about my briefing as a result.' be appropriate? Any advice from serving/retired Officers on this etiquette would be appreciated.