<prompt> Translate the following text to EnglishSera ya sasa ya ununuzi ya DOD pia inasema kwamba awamu ya maonyesho ya mfumo huanza baada ya prototypes zimejengwa na kuonyeshwa katika mazingira husika wakati wa ushirikiano wa mfumo.  <response>: DODs current acquisition policy also states that the system demonstration phase begins after prototypes have been built and demonstrated in a relevant environment during system integration. 