* D.P. Associates, an Arlington company that develops electronic classrooms and interactive training for the military, was acquired by L-3 Communications, a New York-based supplier of intelligence, surveillance and reconnaissance systems and products. Terms were not disclosed. L-3 said the acquisition is expected to increase its 2005 sales by $40 million.

* SRA International, a Fairfax government technology contractor, won a five-year, $46.8 million contract from the Drug Enforcement Administration to provide systems engineering services. SRA will provide enterprise-wide services to help the DEA sustain and modernize its information technology infrastructure. SRA also won a five-year, $19.2 million contract from the Defense Department to provide program management support to the Logistics Automatic Identification Technology Office.

* AC Technologies, a wholly owned subsidiary of PEC Solutions of Fairfax, won a one-year, $13.8 million contract from the U.S. Postal Service to support systems development and engineering. PEC Solutions also said it did not receive a follow-on procurement worth $10 million from the Drug Enforcement Administration for one of its current support contracts. The loss will not have a material adverse affect on financial results, according to management.

* CACI International was urged by the California Public Employees Retirement System's board of directors yesterday to conduct an independent investigation of the Arlington government contractor's involvement in the Abu Ghraib prison scandal in Iraq. CACI provided interrogators to the Army at the prison, and one of its employees was implicated in an Army report on abuses there. In August, the company said preliminary results of an internal investigation did not produce "credible or tangible evidence that substantiates" the accusations against its employees. Yesterday, CACI said Phil Angelides, the California state treasurer who sharply criticized the company and urged the pension fund to take action, "has an appalling ability to distort the truth . . . in order to promote his political ambitions." The retirement fund owns $12 million worth of CACI stock.

* Martek Biosciences of Columbia said yesterday it is asking a U.S. district court in Maryland to declare it has not reached a key regulatory milestone for its lead product, a nutritional oil for baby formula. Shareholders of OmegaTech of Colorado, which Martek acquired in 2002, contend the milestone has been met, meaning Martek should issue them about 670,000 shares of common stock, worth more than $33 million based on yesterday's closing share price of $49.44. The company has previously said up to 1.9 million shares would be issued as milestones were reached.

Compiled from reports by Washington Post staff writers.