My technique is pretty similar to Rik's in terms of exhaling as I draw. It needs to be remembered that archery is a marginally more aerobic sport then gun shooting - which I assume is the 'in the army' shooting you refer to Thunk.
To go into a bit more detail:
- Deep breath when coming to pre-draw
- Partially exhale as coming into full draw and references
- Finish exhaling as I expand through the shot