<prompt> Translate the following text to EnglishDOD hivi karibuni ilibadilisha sera yake ya ununuzi ili kusisitiza ununuzi wa mageuzi na kuanzisha awamu tofauti za ushirikiano na maonyesho katika mchakato wa maendeleo ya bidhaa.  <response>: DOD recently changed its acquisition policy to emphasize evolutionary acquisition and establish separate integration and demonstration phases in the product development process. 