The private equity firm Aurora Capital Group last Friday said it has agreed to acquire National Technical Systems [NTS], a provider of engineering services to the aerospace, defense, telecommunications and other industries. Lightning simulation on nose cone. Photo: NTS Aurora said it will pay $23 per share for NTS, a nearly 39 percent premium to the company’s closing stock price last Thursday. NTS’ shareholders are expected to meet no later than Oct. 31 to consider and vote on the merger agreement.…