Chandigarh, In order to pay tribute to Sardar Vallabhbhai Patel, on his birth anniversary, today Rashtriya Ekta Diwas was observed at Punjab Raj Bhavan. Officers and Staff of Punjab Raj Bhavan today took Pledge in the presence of the Punjab Governor and Administrator UT Chandigarh, Mr. Shivraj V. Patil, to preserve the unity, Integrity and the security of the nation and to inculcate the feeling of national unity among one and all.