Welcome to today's Defense Business Briefing, your weekly roundup of the latest defense industry news.

Newport News Shipbuilding requests supplier base assess steel tariff impact

Newport News Shipbuilding has asked its supplier base to assess what impact, if any, tariffs on steel and aluminum imports will have on future business, according to the company's president.

HII to reactivate Pascagoula River east bank facilities

Huntington Ingalls Industries' shipbuilding division plans to reactivate its facilities on the east bank of the Pascagoula River, the company announced today.

Boeing HorizonX invests in British company Reaction Engines

Boeing's HorizonX Ventures has invested in Reaction Engines Limited, a manufacturer of advanced propulsion systems based in the United Kingdom.

SOSi acquires STG Group Holdings

Reston, VA-based services contractor SOS International has acquired cyber and data solutions provider STG Group Holdings, Inc.

Polaris Alpha buys Fourth Dimension Engineering

Polaris Alpha is acquiring Columbia, MD-based Fourth Dimension Engineering.

Work joins board at HawkEye 360

Former Deputy Defense Secretary Bob Work has joined the advisory board at HawkEye 360, along with retired Lt. Gen. John Mulholland, the former chief of Army Special Operations Command, according to a company announcement.

Newport News Shipbuilding gets new chief counsel

Huntington Ingalls Industries recently announced that Jon Arena had been named vice president and chief counsel of HII's Newport News Shipbuilding division.

Bibb joins J.F. Lehman & Company's operating executive board

Private-equity firm J.F. Lehman & Company this week announced the appointment of Caroline Bibb to its Operating Executive Board.

The week ahead

The week ahead is full of military posture hearings on Capitol Hill and think tank events featuring senior Pentagon officials.

Military officials warn of fragile readiness gains ahead of FY-20 budget fight

The defense industrial base is in a state of stable recovery after several years of workload stress and funding uncertainty, but recent readiness gains will be at risk should Congress be unable to cut another spending deal in fiscal year 2020, according to senior military officials.

TRANSCOM chief says contractors not strong enough on cyber

The head of U.S. Transportation Command says his organization is pushing its contractors to increase their cybersecurity, but he is concerned pushing too fast and too hard will freeze some companies out.