Trump's promises face skepticism from experts and would require big military trade-offs, including possible troop reductions in the Army.

More than once, Trump has said Michigan workers would play a role in the system’s manufacturing, although he did not mention the state during his Oval Office announcement this week. U.S. Sen. Jim Banks, of Indiana, at the Trump event said “Indiana is going to help you make it.”

India's integrated air defence system consolidates data from Army, Navy and the Air Force to intercept and take on aerial threats through the Integrated Air Command and Control System (IACCS).