redleg it must be the Army training.
Something else to consider. When you to an event as a team make sure everyone has a list of who has what. The staging area at an event can be pretty large with a lot of people. If everyone in your group knows all the gear it will be easier to find in case something comes up missing.
If you have multiple markers and take them all to an event make sure your case is able to be locked and you can secure it to a bench or something like Menace suggests.
The average theif you would encounter at an event is one of opertunity. Meaning if they have the chance they will take it. As far as my knowledge no one would show up to an event to steal gear so they won't be prepared for locks and chains.