Admiral William McRaven Charles Dharapak / AP Is a Navy SEAL quieter than a ninja?

Six-year-old Walker Greentree is a kid in a military family who was determined to find out, so he wrote to Admiral William McRaven.

McRaven is head of U.S. Special Operations Command, credited with organizing and executing the raid that killed Osama Bin Laden, and is a Navy SEAL himself — he's without a doubt one of the deadliest men on the planet.

Surely, he would have an answer.

Here's how it all started, according to military nonprofit Blue Star Families:

One afternoon while playing with a friend in the yard, the young Greentree was scolded by his mother. "Be quiet like a SEAL," said Vivian Greentree. His friend immediately replied — as one would expect from a 7-year old. "Ninjas are quieter than SEALS." And thus, a monumental argument began. WHO is quieter? Ninjas or SEALS? SEALS or Ninjas?

Greentree wrote a letter to McRaven, and McRaven wrote back with an answer: "I think ninjas are probably quieter than SEALs, but we are better swimmers, and also better with guns and blowing things up."

See both letters below in a graphic from Blue Star: