South Korean and U.S. soldiers on Monday displayed their readiness against any possible threats in a live-fire exercise which involved the Stryker Interim Armored Vehicles. Four Stryker vehicles and some 40 soldiers took part in the training exercise held at a firing range in Pocheon, 40 km northeast of Seoul. The live-fire exercise, highlighting the capabilities of the Stryker vehicles, was part of ongoing annual joint military drills between the two countries that the North Korea has called a rehearsal for invasion.Seoul has said that the drills are defensive in nature. The Stryker vehicles have been deployed in South Korea from Fort Lewis, Washington, for the Key Resolve/Foal Eagle annual drills, which began on February 28 and this year involve 12,300 U.S. troops and some 200,000 South Korean soldiers. The annual joint drills run through April and are composed of some 35-40 exercises.