WARSAW: Sweating and out of breath, young Poles throw grenades and practice evacuating the wounded at a training ground outside Warsaw. Instead of relaxing at the beach, they have chosen to do army drills over the summer holidays. Nearly 10,000 men and women have volunteered for the month-long, paid “Vacation with the Army” program, which the defense ministry launched to promote military service among young people as Poland beefs up its security.