This is an off shoot of Rak’s topic on how much weathering and chipping is appropriate.
I think posting examples would be helpful for the discussion.
Here is an abandoned tank. Look at the amount of chipping and rust.
Compare the ratio of chipping to dust ratio.
Destroyed WW2 tank
Here is a tank that has had not had a paint job in at least 30 years and is set to become a range target. When you see a model with faded paint, keep that in mind.
Abandoned tank from Vietnam.
WW2 Panzer IV
Chipping or rust?
A rusty range target
Here is a tank that has not been painted in 70 years awaiting restoration.
This was last maintained in "67 or "73 before being abandoned. Last time it could have been painted was almost 50 years ago.