FDIC and USPS also are not government agencies. They are government-owned corporations. The first sentence on the Wikipedia entry on the topic includes the phrase "unlike the federal agencies." https://en.wikipedia.org/wiki/State-owned_enterprises_of_the_United_States
Only got FBI, CIA, NASA, IRS and CDC. Thought WHO was the food one. (recognize NSA in hindsight). And tried UPS for mail (might ve slipped up though trying upc..).
This was a little tricky, some of the acronyms are extremely commonly used (FBI, CIA, etc.) so much so that you rarely hear the full name. Others though I've never heard referenced by their acronym (National Institutes of Health and Bureau of Labor Statistics) for example.
I tried ATF as well. I am sure there is a difference between ATF and DEA, but this is a good example of how the government agencies overlap. I wonder how much tax money would be saved if government agencies didn't overlap and they were run efficiently?