I know that customisation system is far away form us, but I want to suggest a decal type that I think is really cool and must be in the game.
The idea is that this type of decal will display your achivments by usage of historical markings, decorations and medals.
I would suggest to give them for the largest killstreak of the particular soldier / vehicle in one match (or maybe in one life but it may be too difficult), examples:
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infantry
(Call me a werhab but I’ll use mainly german army as an example).
For destroying 3 tanks with hand held weapons in a match, soldier will get sliver tank destruction badge (for 1 tank historically but it’s too easy).
For destroying 5 tanks with hand held weapons in a match, soldier will get gold tank destruction badge (like historically) that will replace the silver one.
It will be displayed on his arm.
But markings like orders should also be avalable and displayed properly (so on the chest).
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Tanks
Yeah, you guessed it, stripes on the barrel.
Or hull markings. In this case you will be able to select the placement.
One tank = one mark. If a tank gets 5 enemy tanks destroyed in a match it will have 5 markings. In every battle it wil have 5 untill it scores 6 tank destructions in a match. Then it will have 6 markings instead of 5.
It should have a separate counter for planes and maybe other stuff. -
enplacements
Basically the same as in case of tanks.
Planes, tanks etc. have separate counters.
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planes
The same. Separate counter for tanks, planes etc.
Also in multi national campaigns there could be a version of this decal that will show the nationality of the enemy planes you shot down (like on the picture).
Those are only examples. It can be done with all combat performance markings.
If you have multiple achievements on one soldier then you will be able to choose 1-2 you want to display, to avoid this: