In December 2010, the Government Accountability Office identified some problems with the designs including extremely long crew training time, unrealistic maintenance plans, and the lack of comprehensive risk assessment. On 13 December 2010, both production teams extended their contract offers until 30 December in order to give more time for the Navy to push through the plan. The Navy would be forced to award the contract to only one team if it failed to secure Congressional approval. The Navy budgeted $490 million for each ship while the Congressional Budget Office projected a cost of $591 million for each ship. Navy acquisition chief Sean Stackley testified to a Senate panel that the actual price range was $440 to $460 million.