I've recently come to realize how difficult it is for federal interns to coordinate rotations across different agencies. It's not that bosses oppose it; quite the opposite, they encourage it. Rather, it's just tough to line up different agencies' policies for developing memorandums of understanding (MOU) via email and phone.
This difficulty is one of the biggest obstacles to rotations getting off the ground, and I know from talking with others that I'm not the first to experience this. (I know many of you in Young Government Leaders have felt this pain).
The federal government should either use the MAX Federal Community for government-wide intern rotation collaboration or build a site specifically for it. I favor the first option since it already exists; the site is very secure; already has 52,000 people; and is stress-tested up to a quarter million people.
A main page could be called Government-Wide Rotations, and then different pages should be set up for collaboration between agencies. For example, the Office of the Secretary of Defense (OSD) could have an intern rotate with the Center for Disease Control (CDC). The page under Government-Wide Rotations could be labelled OSD-CDC Rotations, and pages under that one would be restricted to the main parties involved. The allows for fast, secure, and easier file sharing and communication among different parties.