Dean, greetings. If '1802' refers to the date your interested in, it is outside the time frame of this forum. You may do better posting your question at VWF"s sister site, Napoleonic Wars Forum which deals in the period 1793-1815.http://www.napoleonicwarsforum.com
if you do have a date, you should be able to find your man listed in the regimental Muster Rolls at the National Archives at Kew, which would require a visit. His discharge papers may be available on line.