A new officer I had in mind was Charles Portal. Marshall of the Royal Air Force during World War 2. He was a strong advocate of area bombing and took over as head of the RAF during the Battle of Britain.
I was thinking that since he was a "strong advocate of area bombing" he could give stat boosts to Bombers and Strategic Bombers. His max level would be 15, and would be the $30 officer for only affecting 2 units, both the bomber units. Here are what I was thinking for the stats that would be boosted (from lvl 1 to lvl 15(max)
Attack vs Infantry: +1% - +25%
Attack vs Vehicle: +1% - +25%
Attack vs Vehicle: +1% - +25%
Ammo Max: +1%- +15%
Movement Speed: +1% - +20%
Fuel Max: +5% - + 25%
Food Max: +5% - +30%