A report from the U.S. Government Accountability Office finds that since shifting to the Multiple Award Contract-Multi Order (MAC-MO) contracting approach for ship maintenance work in 2015, the Navy has increased competition opportunities, gained flexibility to ensure quality of work, and limited cost growth, but schedule delays persist.
During this period, 21 of 41 ship maintenance periods, called availabilities, for major repair work cost less than initially estimated, and average cost growth...
https://www.marinelog.com/news/gao-reports-on-navy-ship-maintenance-under-mac-mo/