Boil spaghetti according to package directions.  Drain and rinse well with cold water.  Pour into large bowl.  Chop vegetables and add to spaghetti.  Add seasoning and dressing.  Toss to coat well.  Chill several hours or overnight. 

My husband's co-workers request this every year for their Christmas party and someone always wants the recipe.  I also serve this at my family's Fourth of July celebration.