From photographs and film reels taken during the training at the Assault Training Center, we know that the 29th did not wear any identifying insignia on their uniforms. This is most likely due to the secretive nature of the D-Day invasion.
Their helmets are always blank, and they are wearing HBT coveralls with no patch when the video cameras are rolling.
The 29th images that we have from books show that on the dunes they would use the grass and pack it into their haversacks, belts and helmets to camoflage.
There is one film reel of various saunton/slapton footage which shows troops training in mock up landing craft made of scafold poles or wooden boards. There is no way of telling who they are due to the blank uniforms. In another film reel we see some vehicle movement at Saunton which shows the tactical 29th bumper markings on a few trucks and jeeps (pre D-Day the tactical signs are drawn on the right side of the bumper if you are looking at it from the front. for D-Day though the signs were painted on the right side in yellow)