This is my idea for adding Aces to land and naval units, if they are not implemented yet. Perhaps a handful of well-known soldiers can become Aces from their respective divisions/ships such as James Hill (Commander British 1st Parachute Brigade), Kenneth Bailey (1st Marine Brigade), Fritz Witt (1st SS Panzer Division ‘Leibstandarte Adolf Hitler’), etc. The users on this forum could provide an extensive list if needed 
Using GERMAN ranks as example.
Aces are created by SUCCESSFUL engagements in battle over time. Such as successful attacks and defenses. When the Ace is found, they progress through four levels/ranks.
There are four levels of Land Aces to acquire: Hauptmann, Major, Oberst, Generalmajor.
There are four levels of Naval Aces to acquire, Kapitänleutnant, Korvettenkapitän, Fregattenkapitän, Kapitän zur See
All Aces add a moral boost to the corresponding division. At each level they attain value X to their acquired skill. Once reached level 4, they can be moved to command other units.
Armor Aces
• Tank Aces increase Hard Attack by value X
• Assault Gun Aces increase Defensiveness by value X
• Tank Destroyer Aces increase Piercing by value X
Infantry Aces
• Infantry Aces increase Soft Attack by value X
• Motorized/Mechanized Aces increase Max Speed by value X
• Mountain Aces increase Mountain Attack by value X
• Paratrooper Aces increase Defensiveness by value X
• Marine Aces Amphibious Attack increase by value X
Ship Aces (*Do not know values on ships yet so this is purely speculation)
• Destroyer Ace increase ability to *hunt subs
• Light/Heavy Cruiser Ace increase speed
• Battlecruiser/Battleship Aces increase armor
• Carrier Aces increase *aircraft readiness
• Uboat Aces increase *detection ability
Obviously all value and abilities are subject to change. But you get the general idea. I think this would add a nice aesthetic addition. A personal touch to follow the paths of your acquired Aces. Not enough to be an extreme game changer, or even major balancing issue with the game overall.
Using GERMAN ranks as example.
Aces are created by SUCCESSFUL engagements in battle over time. Such as successful attacks and defenses. When the Ace is found, they progress through four levels/ranks.
There are four levels of Land Aces to acquire: Hauptmann, Major, Oberst, Generalmajor.
There are four levels of Naval Aces to acquire, Kapitänleutnant, Korvettenkapitän, Fregattenkapitän, Kapitän zur See
All Aces add a moral boost to the corresponding division. At each level they attain value X to their acquired skill. Once reached level 4, they can be moved to command other units.
Armor Aces
• Tank Aces increase Hard Attack by value X
• Assault Gun Aces increase Defensiveness by value X
• Tank Destroyer Aces increase Piercing by value X
Infantry Aces
• Infantry Aces increase Soft Attack by value X
• Motorized/Mechanized Aces increase Max Speed by value X
• Mountain Aces increase Mountain Attack by value X
• Paratrooper Aces increase Defensiveness by value X
• Marine Aces Amphibious Attack increase by value X
Ship Aces (*Do not know values on ships yet so this is purely speculation)
• Destroyer Ace increase ability to *hunt subs
• Light/Heavy Cruiser Ace increase speed
• Battlecruiser/Battleship Aces increase armor
• Carrier Aces increase *aircraft readiness
• Uboat Aces increase *detection ability
Obviously all value and abilities are subject to change. But you get the general idea. I think this would add a nice aesthetic addition. A personal touch to follow the paths of your acquired Aces. Not enough to be an extreme game changer, or even major balancing issue with the game overall.