Does charge here mean "a special assignment"? President L. Rafael Reif's Charge to the Graduates

Context:

President L. Rafael Reif's Charge to the Graduates
'I am certain you will use what you have learned here to make the world a better place.'

Below is the prepared text of the charge to the graduates by MIT President L. Rafael Reif for the Institute’s 147th Commencement, held June 7, 2013.

To the graduates of 2013: Congratulations! I know I am the last thing standing between you and your diplomas – so, even though I have a great deal I want to tell you, I will be brief...

More:
http://web.mit.edu/newsoffice/2013/president-reif-charge-to-the-graduates-0607.html