Aecom Technology Corp. and Shaw Group Inc. said that their joint venture, Pacific Contingency Services LLC, was among six defense contractors awarded a large U.S. Navy contract. The contractors will compete for up to $900 million in project orders from the Naval Facilities Engineering Command-Pacific.

The contract is similar to one that Aecom and Shaw’s Atlantic Contingency Constructors LLC joint venture has with the Navy to address its global construction needs. It has a one-year base period and four option years.

The contractors will provide services in response to natural disasters, humanitarian efforts and military actions around the world.

Aecom of Los Angeles is an engineering firm that provides technical and management support. The Shaw Group is based in Baton Rouge, La.

The Navy contract is the fourth Aecom has announced this week. On Wednesday it reported a highway construction management contract, valued at $148 million, for the Tuen Mun-Chek Lap Kok Link in Hong Kong.

Earlier in the week, it said the U.S. Agency for International Development awarded it a contract, worth up to $177 million, to provide professional, technical and management support services to help people in Afghanistan better respond to instability in their country. In addition, a joint venture in the United Kingdom won a $24 million contract to upgrade a wastewater treatment facility for Yorkshire Water in the U.K.

Aecom shares were up 87 cents, or 4.5 percent, to $20.04 in midday trading on the New York Stock Exchange.