"newly identified requirements" is the most predictable possible thing in DoD software writing though, as it is in other industries. This is why it is so important to reduce the amount of time it takes to go from identifying requirements to shipping software to product that starts to meet those requirements, as pointed out by the Defense Innovation Board's Software Acquisition Practices report: https://media.defense.gov/2019/May/01/2002126690/-1/-1/0/SWA...

To be fair, it was five years later. A lot can happen to organizational processes in that time. As organizational processes change (or new ones come about) so will the software that serves those processes.

> the most predictable possible thing in DoD software buying though,

FTFY