 Complete the following phrase:  In 1941 Kharchenko became underleitet and a platoon commander in the 22 Detached Engineering and anti-gas battalion of Local Anti-Aircraft Defence troops. In 1942 he came back to the unit where he had served in non-commitioned positions -- to the 6th Engineering and anti-gas regiment of the NKVD antiaircraft defense troops. He helped to defuse more than 26,000 German shells, mines and bombs during the 