SERE...anything that can get you out of the enemies back yard and get you home is a blessing. APALS are amazing little tools that can help you stay off the grid and use only the lights you need. An IR light to signal at night for aircraft over head. A few silver faced APALs to use as a reflector. Red and Blue that you can cup in your hand and hide the light from the world as you read your map. There are SOPs for SERE, but there is no reason to make SERE tougher!