- John: I’m a doctor!
- Sherlock: And a SOLDIER! As you keep reminding us all.
Wait, when? Oh that ONE time when John tackled him roughly to the ground in a strangle hold? John’s strong arms unrelenting, hot breath on Sherlock’s cheek? Bodies close together?
- John: You ought to remember, Sherlock, I was a soldier! I killed people!
- Sherlock: You were a doctor!
- John: I had bad days!
Sherlock must have had this instance in mind when he spoke as though John is always reminding everyone that he is a soldier. (This memory is on constant replay in Sherlock’s mind palace, and he forgets it only happened once.) I doubt John brings up his military service in conversation very often, if at all. Can you imagine….
- John: Pass the milk please. I’m a soldier and I’m thirsty.
- John: Sherlock, your violin playing is very nice. As a soldier, I appreciate lovely music.
- John: Sherlock if you put one more hole in that wall god help me this soldier is going to get very angry!
But that must be what Sherlock hears! Everything John says or does is a reflection of his army background. His military service deeply affected him and shaped his life, and to Sherlock, the effects of it must be glaringly obvious every day. Even the way he walks/ marches, the way he stands at attention or at parade rest, in Sherlock’s mind he is waving a big, sexy flag saying SOLDIER HERE. Every time he looks at John, he sees “Captain” and as far as Sherlock is concerned, he isn’t retired.
Also, I’m pretty sure that Sherlock (not John) is the one always bringing up John’s military background:
- Sherlock:Afghanistan or Iraq?
- Sherlock:You’re a doctor. In fact, you’re an army doctor…
- Sherlock:All the girls like a soldier.
- John:It’s Sailor.
John may see the battlefield when he walks with Sherlock, but Sherlock sees the soldier. And it’s very distracting.