As a total [but interested] outsider, the very nature of army vs RN vs RAF modus operandi suggests that the army [teeth arms] have an intrinsic advantage with a platoon-level "DO" and a 2 i/c, his sergeant.
I hope it remains true that the dictum was "look after the horses [or modern substitute], look after the men and their feet, look after yourself"
The young subaltern is much closer to the troops than RN and RAF by the nature of the beast.