Congress needs to approve the retirement plan, which has run afoul of lawmakers in the past.
The service's acquisition chief made the comments a day after Secretary Frank Kendall told lawmakers the latest ARRW test failed.
Secretary Frank Kendall confirmed this month's ARRW hypersonic test wasn't successful, and said the service is more committed to another weapon.
The Air Force said in a release that "several" objectives were met, but refused to detail further the results of the test.
