Aerospace and defense company General Dynamics is selling its Fidelis security unit to private equity firm Marlin Equity Partners.

Fidelis, based in Waltham, Mass., is currently part of the mission systems division of General Dynamics, and offers data protection services from network security and cyber threat intelligence, to data breach investigation and response. Marlin mostly owns technology, healthcare, consumer services, and manufacturing companies.

Marlin swallows Fidelis

Fidelis will become an independent company after the acquisition, which is expected to complete in the second quarter of 2015. Terms of the deal were not provided.

Current Fidelis president Peter George, a 20-year network security veteratn, will become CEO, leading a team with plenty of experience in the information security industry, including service for government intelligence services and the armed forces.

Fidelis is number 281 on the Cybersecurity 500 list of the hottest infosec firms to watch – a quarterly inventory compiled by research firm Cybersecurity Ventures. Its main product is Fidelis XPS, a network security platform aimed at detecting and preventing malware infections. The company also has a data breach incident response team and an in-house threat research team.