This is from something that happened last night on Survivorman. Les went to use a flare and nothing, twice. The use by dates were in the 90s. Way out of date.
Go check the gear in your BOB. See if anything is way out of date. Like chem lights, they do go bad. Check lighters to see if they work. Check your food. Batteries and spares?
Just something I will be doing this week.