By Reuters Staff 2 Min Read FILE PHOTO: A RAF Lockheed Martin F-35B fighter jet taxis along a runway after landing at the Royal International Air Tattoo at Fairford, Britain July 8, 2016. REUTERS/Peter Nicholls/File Photo (Reuters) - Rocket maker Aerojet Rocketdyne Holdings said on Friday it had received a second request from the U.S. Federal Trade Commission (FTC) for a regulatory review of its proposed takeover by Lockheed Martin. The FTC review is part of a process under the Hart-Scott-Rodino Act to scrutinize potentially anti-competitive mergers. A second request by the FTC could indicate heightened antitrust scrutiny, as the vast majority of deals reviewed by the government and the Department of Justice are allowed to proceed after the first preliminary review.