In early February 1944, in order to simplfy support and logistics for the Tactical Reconnaissance Squadrons of 2TAF equipped with the Mustang I and IA aircraft, they consolidated all the Mustang I aircraft into one Recce Wing and all the Mustang IA aircraft into another Recce Wing. That meant that in terms of servicing the aircraft armament, spares, ammunition, and ability of the Squadrons within the Wing to share aircraft if required (given early RAF planner predictions for a high loss rate for the Tac/R squadrons during the invasion period), it greatly simplified arrangements. One Wing had the Mustang I armed with the mixed MG & HMG armament, the other Wing initially all Mustang IA all with 20mm cannon armament. Where it became complicated later was the introduction of the Mustang II just before D-Day and the Hawker Typhoon FR.1b in late July '44 into the Wing that had the Mustang IA - so that added the 0.50in HMG into the mix, whilst the Typhoon FR.1b kept the same 20mm Hispano armament as the Mustang IA. Of note, the gun buttons on the Mustang IA control column allowed for selecting firing the inboard 20mm only, or all the 20mm. So if the pilots chose to increase firing time, they could by selecting initially only the inboard cannons. But they didn't like 'halving' their armament and normally would use all. Exception was when they were on armament camps doing practice air to air firing against towed drogues, they would tend to use only the inboard cannon initially until they ran out of ammo then go to 'full' which would then use the outboard. That way they had less chance of shooting away the towed drogue using the full weight of the 4 x 20mm cannon. They would also 'mix' the ammunition types in the 20mm cannon belts so that on the cannon firing, different projectiles types would be exiting the barrels of each gun for best effect on the target.