This first group of 1 to 4. These seem the webbing from a English pattern 37 or a similar clone, perhaps Greek.
In this second group, 7 and 8, would be from the DDR, to hold the Zeltbahn or a marmite to the backpack.
9, looks like a strap from a type M1 helmet.
10, gives me the earmarks of being Belgian, the camo and plastic thermoforming, if I'm right.
11, 37 Pattern Brace Attachment.
The rest of the group, no idea.
The third group, no idea.
I hope that together, we can identify this 17 pieces.
Thanks in advance.