They’re definitely brushes. I saw the same thing much more clearly in a different photo the other day (can’t remember where, sorry), and was curious just like the OP. Have no idea why they’ve got them, or why they’re in such an easy-to-hand position. Is impromptu archaeology common in warzones?
There is a green nylon-handled paint brush/shaving brush thing around which appears to be an issue item for cleaning dirt out of the rifle. I’ve never felt moved to buy one - they don’t look all that effective and I’ve got other things for that sort of stuff. Typical of our ‘one pound shop’ British Army.
There is also a copper wire brush which is moderately useful in the workshop.
They also have a special comb to clean the paintbrush when it gets covered with sand; and they have a spray bottle and a cloth to clean off the comb after it gets dirty; and a small tub of cleaning fluid to clean the cloth; and a little battery-operated heater to dry it; and a tiny toolkit to repair the heater when it breaks down, and a tiny bottle of oil to lubricate the tools when they get rusty, and