Look at any modern aircraft on the ground and one thing you will see are the bright red streamers from all over the underside of the plane. These are Remove Before Flight (RBF) flags that are attached to all sorts of safety devices. Mostly they are hooked up to things like landing gear pins, armament pins and intake/exhaust covers. 

The purpose of them is to remind the ground crew to remove the items so that the aircraft can properly operate. Sometimes in the confusion of hurried operations, items can be left saftied. By having tags attached to these devices, there is no time wasted returning to have the pins removed or going into an operation with weapons that cannot be dropped/used.

These flags come in a variety of red shades and designs, though they are all long, thing streamers. EC has produced three of the more common ones. These are not decals, but paper. You cut them out, fold them over, glue them together and then attach them to wire for use on your kit. EC provides instructions on just how to use them. Where to put them is a result of your own research. There are enough of them to do a lot of aircraft and to make a bunch of mistakes along the way as well! Though it doesn't show well in the above image, the ones on the far left are in daglo red.

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