LONDON - Iran's Islamic Revolutionary Guard Corps (IRGC) said on Wednesday it will continue increasing the country's defensive capabilities, and will not surrender to pressure over its missile program. '[Iran's] missile program has turned into the main challenge of the enemies of the Iranian nation, especially the United States, the Zionist regime [of Israel] and the Saudi rulers... 'Increasing defensive capabilities will remain the main strategy of the armed forces,' the IRGC said in a statement carried by the Tasnim news agency.