My attempt to make a D-5 variant of the P-51 Mustang including a custom serial and registration number.

From War Thunder Wiki

The P-51D-5 Mustang is a rank III American fighter with a battle rating of 4.0 (AB/RB) and 5.0 (SB). It has been in the game since the start of the Open Beta Test prior to Update 1.27.

The P-51D is, undoubtedly, the shining star of the USAF branch. With its sleek laminar-flow wing, classic American M2 Brownings, high-visibility cockpit, and immensely powerful engine, the P-51 is most definitely a force to be reckoned with. It is endowed with very good high-altitude traits, endurance, and speed. Use it accordingly. This fighter is best suitable for Boom & Zoom.

As standard with the USAAF, the Mustang has six M2 Browning machine guns in the wings. It can load bombs and rockets like most other planes in the USAAF. The armament, though effective, still requires patience to master. The M2s have a great range, but the damage decreases substantially as your proximity from your opponent increases. It is best to shoot for the engines and wings of any plane, because fuselage shots will waste your ammunition.

The armament is pretty versatile; the 12.7 mm M2 machine guns can easily destroy most soft targets: light tanks, AAA, SPAA, soft ground units, artillery, etc. Against bombers and heavy fighters the incendiary rounds will effectively set them alight.

The ground attack capability of the Mustang is notable, as it can carry 2 heavy 1000 lb bombs, as well as 6 rockets. Thus, the Mustang is also an effective attacker/ground attack aircraft.

Credits goes to Moonlight810 for the Original plane