MOUNT VERNON — Mitchell Riley of Mount Vernon was recently promoted to first lieutenant in the Army Corps of Engineers.

Riley graduated from Maranacook Community High School in 2005 and from Worcester Polytechnic Institute in 2009 with a degree in mechanical engineering. He is currently a platoon leader with the 95th Route Clearance Company which is deployed in Helmand Province, Afghanistan.

Riley is the son of Dorcas Riley of Mount Vernon and Douglas Riley of Readfield and the grandson of Marie Benner of Waterville.

MONMOUTH — Scott Lewis of Monmouth was recently promoted to the rank of major in the Maine Army National Guard for superior performance as the director of the Maine State Partnership Program with Montenegro.

Lewis served in various leadership positions in the 133rd Engineer Battalion, 240th Engineer Group and Joint Force Headquarters, Maine Army National Guard. Lewis deployed with the 133rd Engineer Battalion in support of Operation Iraqi Freedom in 2004-05 as the executive officer for Bravo Company, 133rd Engineer Battalion. The unit received the Meritorious Unit Commendation from the Department of Defense. He also commanded the 262nd Engineer Company, Maine Army National Guard.

Lewis graduated from Lake Region High School and received a degree from the University of Southern Maine. Lewis lives in Monmouth with his wife Lynn and two children, Kimberlee and Nathan.

WEST GARDINER — Joshua Cochrane, formerly of Bowdoinham, son of Dana and Kathryne Cochrane of West Gardener, was recently promoted from machinist mate third class petty officer to machinist mate second class.

Cochrane joined the Navy in 2008. He is stationed at the King’s Bay Submarine Base in Georgia, where he lives with his wife and their four children.

SAN ANTONIO — Air National Guard Airman Heather M. Singleton recently graduated from basic military training at Lackland Air Force Base, San Antonio.

Singleton is the daughter of Janie Vafiadis of Cranston, R.I., and Stephen Singleton of Winthrop, Maine. She is a 2006 graduate of Warwick Adult Education in Rhode Island.

COLUMBIA, S.C. — Army National Guard Private Thomas C. Merrill recently graduated from basic combat training at Fort Jackson, Columbia.

Merrill graduated in 2002 from Gardiner Area High School, Gardiner, Maine. He earned an associate degree in 2007 from Northern Maine Community College, Presque Isle. He is the son of Thomas Merrill and Bonnie Merrill, both of South Gardiner, Maine.

AUGUSTA — Maine Army National Guard has announced the following promotions: Douglas Andrews of Mount Vernon, 488th Military Police Company, to the rank of private 2; Ryan Chamberlain of Augusta, Company B, 3/172 Infantry (Mountain), private 2; Alexander Mckenna of Farmingdale, Detachment 1, 136th Engineer Company, private 2; Richard Orio of Augusta, 1136th Transportation Company, private 2; Dean Skehan of Augusta, 185th Engineer Support Company, private 2; Douglas Hayes of Augusta, Joint Force Headquarters, sergeant major; Samuel Atchison of South China, Detachment 1, 262nd Engineer Company, specialist; Marleen Lajoie of Augusta, Medical Detachment, lieutenant colonel; Daniel Dubay Jr. of Vienna, 136th Engineer Company, chief warrant officer 2; Daniel Seymour of Randolph, Detachment 1, 262nd Engineer Company, private first class; and Kenneth Spear of Waldoboro, Detachment 1, 262nd Engineer Company, private first class.