The D-Day stripes on everything that flew over the Beaches may have been as a result of things like the Sicily friendly fire stuff, although I believe those goonies were shot down at night over the fleet so the bands wouldn't have helped much.
Not a quote, but found the following info from "The Day of Battle: The War in Sicily and Italy, 1943-1944".
The friendly fire incident on Sicily was at night. Paratroopers were being flown in to reenforce the 1st Infantry Division, Patton cut the orders aboard USS Monrovia at 8:45am but due to congestion in the signal room the orders didn't reach the units on shore till 4:20pm, Vice Admiral Hewitt later testified that despite being on board the Monrovia did not know of the operation till 5:47pm. It also appears that none of the three regiments operating to the east where the planes would first make landfall knew of the operation till after 10:00pm.
By the time the shooting stopped later that night 23 C-47's had been shot down, 37 were damaged and casualties were finally pegged at 410 although there was some disagreement.