US global health architecture

How confusing is the US global health bureaucracy? Here's a sentence with 6 acronyms to help clear it up:

We tried to map out what the USG GH architecture might look like with USAID as the GHI leader, and OGAC as the PEPFAR coordinator; after several attempts to create a diagram, we gave up.

From "Is USAID Being Set Up to Fail on the GHI?" by Nandini Oomman and Rachel Silverman.