The closely watched search for the next head of the Pentagon’s Defense Innovation Unit is expected to take another four to six months, the outfit’s acting leader says -- a timeline, slammed by one key lawmaker, that would leave the small-budget unit without a director well into fiscal year 2023. Characterizing the effort as “probably mid-stream right now,” acting Director Mike Madsen called the work to hire a candidate to replace Mike Brown, the most recent and longest serving official...