On the U.S. Department of State:

• Department of State (index)
• Office of the Historian

On the U.S. Foreign Service:

• American Foreign Service Association (AFSA)
• Foreign Service Journal

On diplomatic history:

• Triangle Institute for Security Studies (TISS), based at the University of North Carolina - Chapel Hill (our institutional sponsor).
• (Alternate link to TISS website)

On Vietnam:

• Vietnam, a journal.
• Vietnam Portfolio, E. Kenneth Hoffman's beautiful collection of images from wartime Vietnam (as featured in American Diplomacy's series, "Remembering Vietnam").