Question: The 357th Fighter Squadron (357 FS) is part of the 355th Fighter Wing at Davis-Monthan Air Force Base, Arizona, it operates which The 357th Fighter Squadron (357 FS) is part of the 355th Fighter Wing at Davis-Monthan Air Force Base, Arizona??
Answer: 
Fairchild Republic A-10 Thunderbolt II
Fairchild Republic A-10 Thunderbolt II