Some BMP-1 connected issues I found:

• Gunner has no functioning periscopes. Suggest implementing cut-out windows.
• Gunner's position - under a certain angle, the turret lets a ray of light inside.

• Driver's periscopes have overlapping cones of vision, suggest implementing cut-out windows.

• BVP's driving sound is missing the characteristic creaking of tracks.

Suggestion: rename to BVP-1 in English version as well for accuracy :)