The sentencing of a California defense contractor closes another chapter in the long-running corruption case surrounding former Republican congressman Randy "Duke" Cunningham. Brent R. Wilkes was convicted of showering Cunningham with more than $700,000 in perks -- including $500,000 for a mortgage, $100,000 for a yacht he never purchased, submachine-gun shooting lessons and the services of two prostitutes during a stay at a Hawaiian resort. A federal judge yesterday gave Wilkes 12 years in prison for bribery, conspiracy and fraud.