Civil servants have played a crucial role in the transformation and development the country witnessed over the years, President Pranab Mukherjee told a group of IAS probationers who called on him here Tuesday.Addressing the group of over 181 IAS probationers at the Rashtrapati Bhavan here, the president said the persity of our nation needs to be celebrated. He wished them all success in their future endeavours. "What is yours, you will get", he said.The probationers are attending a course at the Bureau of Parliamentary Studies and Training Feb 17-21.