reimbursement payments to america's heroes. tonight national security correspondent jennifer griffin tells us the culprit is not a person, but a machine. >> a 50-year-old computer system at the department of veterans affairs is shortchanging post-9/11 veterans. that's registered in undergraduate and graduate school programs under the g.i. bill are facing mounting unpaid housing subsidy bills. some are even taking on debt as a result of the technological glitch which many on capitol hill predicted in july. >> the trump administration promise to clean up the culture of bureaucratic incompetence inside the v.a., and based on this testimony today, and other hearings we have had, i don't think they have made a lick of difference. >> that from republican mike coffman during a hearing how theft house veterans affairs subcommittee last week as lawmakers try to understand why the veterans were not receiving the housing subsidies along with their tuitions. >> that system is complex. that engine is old.