<span style="line-height: 18.9091px;">Aerospace-defense private equity firm&nbsp;</span><span style="line-height: 18.9091px;">Admiralty Partners Inc</span><span style="line-height: 18.9091px;">. in California is investing $3 million in Ann Arbor-based&nbsp;</span><span style="line-height: 18.9091px;">Arotech Corp.</span><span style="line-height: 18.9091px;">, it announced Wednesday.</span>