<prompt> Translate the following text to EnglishWakati DOD imefanya maendeleo katika miaka ya hivi karibuni, ukaguzi wa hivi karibuni wa mfumo wa silaha wa GAO unaonyesha kuwa matatizo ya kudumu yanaendelea kuzuia gharama za ununuzi, ratiba, na matokeo ya utendaji.  <response>: While DOD has made some progress in recent years, GAOs recent weapon system reviews show that persistent problems continue to hinder acquisition cost, schedule, and performance outcomes. 