The Police Department is looking for two new lieutenants. Selectmen recently approved a plan for a third lieutenant in the department, which has roughly 40 officers. It comes on the heels of the retirement of Lieutenant James Seekell, whom Police Chief Ronald A. Sellon described as a “pillar of the department” and a “steady and strong leader” throughout his 35 years of service. Selectman Olivier Kozlowski said that Sellon’s request to add a lieutenant position “made sense to us,” given the need for experienced supervision. The post, which in future years will cost about $50,000, will also add flexibility to scheduling, Kozlowski said. The only lieutenant currently on the force is Samuel F. Thompson Jr.