BAGHDAD, Feb 23 (Reuters) - US-backed Iraqi security forces closing in on the Islamic State-held western half of Mosul stormed the city's main airport and a nearby military base today, state television said. "Rapid response forces, federal police and anti-terrorism forces stormed Mosul airport... and an al-Ghazlani military camp," said a statement read out on state TV. Since ousting the militant group from eastern Mosul last month, Iraqi forces have sought to capture Mosul airport and the nearby al-Ghazlani military base on Mosul's southern outskirts and use them as a launchpad to retake the western half of the city REUTERS CJ PM1210