A contractor that got its start designing and operating the web portal Army Knowledge Online is poised to get a lot bigger. CRGT has already grown plenty since those early days in the late 1990s. After being bought by private-equity firm Veritas Capital in 2008, the company rapidly diversified, moving out of defense work and seeking to get more specialized. This week, private-equity firm Bridge Growth Partners announced it has agreed to buy CRGT in a bid to continue its...