Of course there will be common sense exceptions. Even the Scout Oath requires the Scout swear only to "do my best." I actually think there should be very little wriggle room when it comes to carrying gear. If you prefer, then you could require them on their honor to always carry their survival gear "unless circumstances make it impossible to do so." The important thing is, if they are caught without their survival gear without some compelling reason, that there will be consequences. I would send them home--it's that important.