I am slightly colour blind. That means I see the colours, but obviously somewhat differently than people with normal vision. Especially contrast between colours seems to be different (I can see blue against green from kilometres away, but red against green is almost impossible).
So, enemy icons against ground are almost impossible to see. Black or blue would be much better colour (actually in Finnish Army excercises Blues are friendlies and Yellow is the enemy)
Also, distinguishing light yellow/green in, for example, dive flaps/brake lights is difficult. If only the green was darker.
I'm sorry I have to bring up WB, but there you could adjust icon colours. Please implement a similar feature here.
Until then I have to use vehicles only or fly bombers :-)