Missiles have a finite lifespan. They use the older ones first. Firing one the day before it has to go back for refurbishment might save money. You won't have to ship it back. Fired missiles are also generally not replaced, under the assumption that a new stock of better missiles will likely be ordered in a few years anyway.
And the cost of the plane is also complex. This pilot/aircraft renewed some quals on this flight, reducing training needs. The aircraft was likely going flying that day anyway. So the net cost of the operation was likely minimal.
And the cost of the plane is also complex. This pilot/aircraft renewed some quals on this flight, reducing training needs. The aircraft was likely going flying that day anyway. So the net cost of the operation was likely minimal.