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On Assignment [ASGN] has agreed to acquire federal services provider ECS Federal, LLC, in a $775 million cash deal that would significantly expand its market share and footprint in the government services business.On Assignment, which has about $2.6 billion in annual sales, currently does about $200 million with the aerospace and defense area, and government services. ECS in 2017 did about $586 million in business in these areas, with 82 percent of work under prime contracts, and On Assignment says…
