Here are the defendants who have pleaded guilty in the Pentagon fraud case and the dates they entered their pleas.

WILLIAM PARKIN, private consultant - Pleaded guilty to bribing a public official, conspiracy to defraud the government and wire fraud. Admitted funneling money he received from Teledyne and Hazeltine Corp. to Stuart E. Berlin, a Navy engineer, in return for information about contracts on friend or foe equipment. March 27.

TELEDYNE INDUSTRIES INC., the parent of Teledyne Electronics of Newbury Park, Calif. - Admitted conspiring to defraud the government and making false statements. The company said one of its employees, Michael Savaides, illegally paid consultant William Parkin to obtain information needed to win a contract for testing equipment to identify whether an aircraft is friend or foe. March 24.

STUART E. BERLIN, former supervisor electronic engineer and branch head of ship systems engineering at the Naval Space and Warfare Command in Arlington, Va. - Pleaded guilty to accepting bribes from Parkin and consultant Fred Lackner in exchange for providing them with information about contracts and manipulating the purchasing system. Also admitted conspiring to defraud the United States and making false statements. He has been suspended from the Navy and awaits sentencing on June 3. March 24.

CHARLES F. GARDNER, former general manager of a Unisys Corp.'s surveillance and fire control systems division in Great Neck, N.Y. - Pleaded guilty to bribery, conspiracy and filing false statements. Admitted bribing Melvyn Paisley, the former assistant secretary of the Navy for research, engineering and systems, by buying Paisley's condominium in Sun Valley, Idaho, for an inflated price. Paisley has not been charged. March 9.

JAMES G. NEAL, private consultant to Unisys - Pleaded guilty to conspiring to bribe Garland Tomlin Jr., a Navy engineer until 1985. Prosecutors said that on instructions from Charles Gardner, Neal transferred money to a company owned by Tomlin in 1983 and 1984. Tomlin has not been charged. March 9.

KENNETH F. BROOKE, private consultant - Pleaded guilty to evading about $66,000 in taxes in 1985. He is the stepson of William Galvin, a private consultant who worked with Gardner. March 9.

JACK A. SHERMAN, former procurement officer with the Marine Corps - Pleaded guilty to bribery and conspiracy. Admitted accepting $43,000 from consultants in exchange for giving confidential information about the competitive bidding process. March 27.

JOSEPH E. HILL, private consultant - Pleaded guilty to four misdemeanor counts of making political contributions in the name of another. Prosecutors said he was asked by Sperry Corp., the predecessor of Unisys, to make illegal contributions of corporate money in his name. Jan. 27.

ROBERT D. BARRETT, former Unisys executive - Pleaded guilty to conspiracy to defraud the government and making false statements in a complicated scheme to channel illegal corporate contributions to the campaign of former Rep. William Chappell, D-Fla. Jan. 27.

MICHAEL SAVAIDES, former Washington marketing representative for Teledyne Electronics - Pleaded guilty to conspiracy to commit bribery. Prosectors said he had an agreement - unknown to Teledyne management - with Parkin and consultant Fred Lackner to tell them about developments inside the company. Parkin paid him. Jan. 6.

HAZELTINE CORP. of Greenlawn, N.Y. - Pleaded guilty to conspiracy involving an air traffic control network, conversion of government property and making false statements. The company hired Parkin to obtain inside information. Jan. 6.

JOSEPH COLARUSSO, former executive vice president of Hazeltine - Pleaded guilty to conspiracy and wire fraud in trying to obtain a contract for Hazeltine. Involved in an arrangement to pay Parkin, the consultant. Jan. 6.

CHARLES FURCINITI, former marketing representative for Hazeltine - Pleaded guilty to conspiracy and wire fraud. Worked with Colarusso. Jan. 6.