Failure to pass the budget means that all "non critical" Federal functions stop. The Military gets IOU's, as does the ICE, Air Traffic Controllers, FBI, etc.
So, all Parks are closed, no personal work on Passports, Visa applications, etc. All regular budget non-critical federal personal are NOT allowed to be at work.
This last happened it in the winter of 95-96, for a total of 28 days. Interestingly, those personal that were furloughed got back pay, so they got an additional 4 weeks of "vacation" (I was in a non-regular budgeted job and I worked through the shutdown)
Personally we are still planning on our trip, we are adjusting the trip to visit non-Federal locations on 1-3 Oct. If the shutdown happens, and stretches out that long, well, it will certain end the trip. After the back-lash over the last shutdown, I do not expect it to go on that long
