I'd like to comment on rn29306's post regarding tube movement.
I can offer some advice regarding intubation in the field. On most incidents you will have to move the patient from the floor to a backboard to the stretcher into the MICU, then take a (usually) bumpy ride to the hospital while running code, take the stretcher out of the MICU and then roll it into the ER. All the tube has to do is move a couple of millimeters and it is dislodged from the trachea. That's a LOT of movement and a very LITTLE distance!
When you intubate, visualize the cords, place an ETCO2 on the ET tube, note condensation in the tube while ventilating, secure the tube, note the reading on the tube at the patient's teeth and place a C-collar on the patient!! This will reduce any movement of the head during all that movement. ALWAYS check breath sounds, ETCO2 reading, the reading of the tube at the patient's teeth (sometimes people will push down while ventilating with a BVM and it will push the tube into the right mainstem) and tube condensation anytime the patient is moved. And always document all of those points in your report.
I have intubated patients sitting up in cars, on the side of the road in the rain at night - I haven't tubed one upside down yet

but give it some time....and I have never lost a tube. I think the C Collar really helps.
Also, if you have access to mannikins, practice intubating every shift. I practice 5 tubes every morning at the beginning of the shift, so if I have to intubate or RSI that day - I'm already warmed up! I haven't "tubed the goose" yet and I contribute that to all the practice!
If you don't have an airway, you don't have a patient!
Hope this helps! Have fun out there!