White background behind the cap badge

[Al-muell]

What was the reason for putting a white piece of paper behind the cap badge? I have seen quite a lot of post-warpictures of soviet servicemen wearing white paper behind their cap badges - just like one of the guys on the picture attached has - they all were picturing soldiers during field activities, so maybe it had some meaning during the manouvers?
Anyone knows?

[Tretov]

Perhaps he is some kind of maneuver supervisor or "referee"?

[Al-muell]

I don't think so. I had a photograph where there was a whole infantry squad with whit background behind their badges and another with a soldier prepearing some meal. Doubt they would be referees.

[CtahhR]

I have some helmets similarly marked with what I believe was once luminous paint.

[Ser-g]

I always took it as one of two options.

1. Since the cap badge was a quick identification of rank, it was maybe made fare more quickly to spot the difference by adding a white back ground.

2. Maybe the people wearing a white paper were to be aggressors, or in other words the bad guy in war games. A similar practice is done by adding different color badges to the Royal Dutch Army when being aggressor.

1 is just a pure practical explanation.
2 is more of a based on my own army experience.

I never know what to pick but it can be a totally different reason.