P-51's and other american fighters also strafed trains, roads, convoys, etc on return from escort missions (since bombers often had short and long range escorts - the long range escort would catch up and releive the short range, and later the short range would meet the returning bombers+51's and releive them.
Either way, releived fighters wrought havoc on supply lines.
Give the P-51 the ability to destroy roads/rail improvements, and a higher chance of destroying improvements.
The-51 was also a good close air support craft (this was its pre-merlin engine role), allow it to do 75% damage rather than 50% in addition to its longer operational range (or give it the 2 operational range upgrades, so the benefit lasts after it is obsolete).
Cutting rail lines could be uber-useful - and an aircraft would do it far better than gunships (with an out and return range of a measly 1.5 tiles)
Our Seals aren't unique relative to other special forces.
Our infantry isnt, our tanks aren't.
We were nothing special in WWI
Our aircraft and carriers are.
Our p-51 was
Our iron clads were
Our calvary might have been
Our B-29 was......
Fat boy and little man were...
UU- the enola gay- before ICBMs, before tactical nukes....
Get a long range bomber that can carry 1 cruise missile/tactical nuke(operational ranges are additive), or standard A-bomb....
Let america start the nuking before rocketry.....