I recently had cause to call an exterminator for yellow jackets inside my home. Rolando Montalvo arrived on the scene and gave us exceptional service. Very knowledgeable and efficient in his job. He found the source and explained all the parameters of this problem as well as information on the initial treatment and future options to keep the problem under control. It was our pleasure to have him and his expertise. Will definitely use Viking again as we plan on making a contract for year round service. Thank You Rolando!!!!!!!