* SI International, a Reston government technology contractor, was one of three companies awarded a contract to compete for projects worth up to $458 million for up to five years by the Office of Assistant Secretary of the Army, Manpower and Reserve Affairs. The contract is for one base year and four option years. Potential human resources, personnel services and support task orders include counseling, employment assistance, well-being programs and records support.

* Anteon International, a Fairfax systems engineering company, won a five-year, $150 million contract from the Department of Army Research, Development and Engineering Command Acquisition Center to support two multinational information-sharing programs. Anteon said it will provide specialized information technology services for global enterprise computer networks supporting coalition forces in the war on terrorism, Operation Enduring Freedom, Operation Iraqi Freedom and NATO operations.

* Opnet Technologies, a Bethesda provider of management software for networks and applications, said that it expects earnings to fall short of expectations for the second quarter ended Sept. 30. The company said it expects a profit of $14.3 million to $14.6 million (2 cents to 4 cents a share), compared with its previous guidance of $16 million to $16.5 million (7 cents to 9 cents).

* Abacus Technology of Chevy Chase won a three-year, $16.7 million U.S. Air Force contract to provide engineering and technical support to the Royal Saudi Air Force for command, communications, computer and intelligence systems.

* Optimus, a Silver Spring public safety technology company, won a five-year, $16 million contract from the Environmental Protection Agency to support the federal lead-based paint program, which provides support in processing certification applications as well as information and instruction about lead-based paint and its hazards. Optimus will also manage a call center and oversee program reporting and records.

* Orbital Sciences, a Dulles satellite company, won a $3 million contract from the Tri-County Metropolitan Transportation District of Oregon to provide an onboard automated stop annunciation system for its fleet of transit buses. The system displays next bus stop, transfer and customer service messages to passengers. Orbital will equip 639 fixed-route buses with the system, beginning with an initial deployment of 282 vehicles that will be completed by July 2006.

* Technology Service, a Silver Spring engineering company, will acquire Phase IV Systems, a Huntsville, Ala., radar, communications and signal processing company, for $5.8 million in stock and cash. Phase IV is employee-owned, and all 80 employees are expected to remain with the company.

Compiled from reports by Washington Post staff writers.