K2 Solutions, Inc., a Southern Pines-based company with operations in Derby, will downsize its workforce later this month due to a lack of business. CEO Lane Kjellsen says the company's major contract with the U.S. Marine Corps is coming to an end at the end of December. "It's been drawing down for a long time and the government has elected not to continue the program at all." The company's services are contracted to the military and include consulting, research and development, training, and intelligence…