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Sorry if these are reposts but I found them today and though I should share them. Found here: Defence.pk
What are those ash-covered holes they all have on the side?
Honestly I can't say for certain. One theory I have is that they are the extraction points for the smoke coming from the engine (have no idea what that is actually called).
Exhaust ports maybe?
Yes it's called the exhaust.
Ok, so after checking it seems like the T-72 has a side exhaust at exactly that spot, so this thing does too. Was kinda wondering because Western tanks have them at the back usually.