Security has been beefed up in the capital ahead of the Republic Day celebrations.The airspace over Delhi has been secured by the Arforce. More than 15000 paramilitary personnel and other state forces will keep a strict vigil in the city besides Delhi Police Personnel. Barricades have been put up at all entry points to keep a watch on all those entering the capital. Patrolling has also been intensified in the city.Twenty three tableaus showcasing the rich cultural heritage and development of the country will be part of this year's Republic Day Parade. Indonesian President Susilo Bamgbang Yudhoyono will be the chief guest at the Republic Day Parade.