How to Prepare for Being Caught Out

It is summer travel season and there is a lot going on in the world. For those of you who have been caught out during an ordered departure, what do you wish you had done before leaving? Are there any specific steps you normally take before going on home leave or other extended leave from post just in case SHTF?

I think that the odds of this happening to me are relatively low, but things can always take unexpected turns and I would like to be prepared. There are a lot of experienced folks in this community and I really appreciate hearing from folks who have been through it. Thanks.