He served in the United States Army during the Korean War, reaching the rank of sergeant.
[4] In the 1980 elections for the General Assembly, Kosco and running mate John B. Paolella defeated incumbents Robert Burns and Paul J.
[6] In 1993, Kosco and Senator John P. Scott co-sponsored legislation to impose a commuter tax on New York residents who worked in the Garden State based on their total family income, which Kosco described as "retaliatory legislation" on behalf of the 230,000 New Jersey residents who worked in New York and were assessed taxes by that state on their income.
[7] In redistricting following the 2000 Census, two heavily Democratic-leaning municipalities — Fair Lawn and Fort Lee — were added to the 38th Legislative District.
These two communities voted heavily for Democrat Joseph Coniglio in the November 2001 elections, who unseated Kosco by a 53%-47% margin.