The CBI has filed an FIR against four Military Engineering Service officials in connection with their investigation into the alleged irregularities into a recruitment conducted in 2012. According to agency officials, three of them were of lieutenant colonel rank at the time of the alleged crime while one of them was a colonel.The CBI has filed an FIR against four Military Engineering Service officials in connection with their investigation into the alleged irregularities into a recruitment conducted in 2012. According to agency officials, three of them were of lieutenant colonel rank at the time of the alleged crime while one of them was a colonel.