Fairfax-based defense contractor ManTech International completed its acquisition of health-care IT firm 7Delta last week. The deal — first announced in April — gives ManTech access to 7Delta’s lucrative IT-overhaul contract with the Department of Veterans Affairs, the company said.

“This acquisition significantly enhances our health-care presence, giving us access to a growing market at VA,” George Pedersen, ManTech’s chief executive, said in a statement.

The purchase of 7Delta is ManTech’s second acquisition this year. The company took over Allied Technology Group, a Rockville-based engineering and information management firm in February. Both deals were completed with cash on hand.

ManTech reported lower revenue in the first quarter and net income plunged by more than 50 percent compared with a year ago as a result of the U.S. drawdown in Afghanistan.

Carlyle Group reduces stake in Booz Allen, again

Carlyle Group is no longer a majority stakeholder of Booz Allen Hamilton.

The private-equity firm sold 10 million shares of its common stock in the consulting firm to Citigroup Global Markets and Barclays Capital, and now owns 45 percent.

In February, the Carlyle Group sold 7.35 million shares to Barclays, cutting its stake in Booz Allen down to 53 percent. The company did not comment on the sale.

GD pulls out of Army contract bid

General Dynamics did not bid on a hotly-contested contract to build a new armored vehicle for the Army, leaving the field open for its only competitor, BAE Systems.

The two contractors have been locked in a public dispute over the contract. General Dynamics filed a protest with the Army last month, arguing that the rules for the vehicle were written so that they favored BAE. The protest was turned down, and the company eventually decided not to prolong the dispute.

In a statement, General Dynamics said the requirements of the Army’s request for proposal “do not allow the company to provide a competitive solution.”

But GD did not rule out the possibility of future involvement.

“The company will not pursue the matter in Federal Circuit Court so as not to hinder the ability to continue to pursue its options to participate in the program,” the statement said.

Meanwhile, BAE Systems announced its bid for the contract, citing the success of its Bradley and Paladin Army vehicle designs.

Antares launch date yet to be rescheduled

Dulles-based Orbital Sciences said a launch of its Antares rocket would not occur before June 17, after an earlier mission suffered an engine failure on May 22. Investigators were trying to determine the cause for the failure, the company said. The AJ26 engine that powers Antares is manufactured by Aerojet Rocketdyne.

The Orb-2 mission is the second in Orbital’s multi-year contract with NASA to resupply the International Space Station through 2016. There are six missions left.

Last month, Orbital announced a $5 billion merger with the defense arm of Alliant Techsystems. The union will create a new aerospace company named Orbital ATK.

Thomas Heath and Christian Davenport contributed to this report.