General Dynamics is promoting the head of its marine business to the newly created positions of president and chief operating officer, the company said Thursday.

Phebe Novakovic, 54, will assume the roles May 2 and report to chairman and chief executive Jay Johnson, 65, the aerospace and defense contractor said.

Her promotion reshuffles the structure of General Dynamics’ executive suite. The company has four executive vice presidents, including Novakovic — one for each of its main businesses. There is currently no president or chief operating officer.

In her new positions, Novakovic will help oversee and manage the company’s four business groups and its headquarters operations, Johnson said in a statement. He said she is “more than ready to assume a larger role in the corporation.”

Novakovic has been executive vice president of marine systems since May 2010.

General Dynamics, based in Falls Church, provides aviation technology, weapons and combat systems, ships and marine systems and information technology for companies and governments.

The company’s stock rose 76 cents, or 1.1 percent, to close at $72.01.