What is the rescue arrow decal on a military jet pointing to? I've noticed that a lot of military jets often have an arrow decal with the wording "RESCUE" pointing to a rectangle of some sort. I tried looking around for information about it but I could not find anything. What is the purpose of that rectangle the arrow points to? 

The other decals seem to be much clearer: e.g. the red triangles are usually ejection seat warning labels and jet intake danger labels.

My own guess is that it is a button/switch device to trigger explosive bolts on the canopy or another mechanism. If so, what does it look like and how does it function? A close-up and a detailed example would be useful.
It's a small door leading to a compartment which contains a handle on a reeled lanyard.  When fully extended, the handle and lanyard activate the pyrotechnic charges which jettison the canopy or other enclosure over the flight crew stations, facilitating rescue.



The arrow may also just point towards the external canopy latch in order to expedite cockpit access and rescue.