Agree with FFF that Tucson is well worth a visit - just don't mix up Davis-Monthan and Tucson International!!!
It'll be more than F-16's you'll see.
If you're heading down that way, might be worth planning a trip overhead, or even a quick stop off at Pinal between Phoenix and Tucson. They send old airliners there to die, a little bit like the Mojave desert, and occassionally have the NASA 747 that piggybacks the Shuttle. Now that's something you don't see everyday. Only problem there is that you can't get out and wander about and security get a bit funny about blokes with cameras as Boeing use it as a military facility for Apache helicopters.
Big recommendation for avoiding is Phoenix itself. Can't think of a single redeeming feature for an unbelievably dull city unless you like golf, fast food and shopping in identical malls.