Reston-based Secure Mission Solutions has been acquired by Parsons Corp. for an undisclosed sum, according to Washington Technology. This is a move for Parsons, based in Pasadena, Calif., to boost its critical asset protection and delivery, cybersecurity services, sustainment and protection. Secure Mission Solutions has more than 550 employees across its offices and becomes part of Parsons’ government services business unit through this acquisition. Parsons acquired Secure Mission Solutions from…