"The 71st Ordnance Group ... is deeply saddened by the loss of Spc. Joseph P. Collette. We extend our deepest sympathies and condolences to his family and friends," Col. David K. Green, commander of 71st Ordnance Group, said in a statement.
The fatalities bring to four the number of U.S. soldiers killed so far this year in Afghanistan. The deaths underscore the difficulties in bringing peace to the war-ravaged country.