I received a phone call a few weeks after I submitted an online application. It was a brief phone call and at the end I was offered the intern position.
Interviewer was very friendly and responsive to my questions and the whole process of scheduling and followup communication was relatively easy. I was wavering back and forth on whether or not to do this internship but the interviewer convinced me
I applied online. I interviewed at U.S. Department of State
Interview
Took about 1-2 months from closing of application to acceptance. One interview. Very Easy. I was interviewed for all three of my top positions. After one makes an offer you can accept or decline depending on whether or not you or more interested in other positions. Once you accept, all other potential offers are dropped.