G-4

G-4, also known as Marine Research and Development Institute (海軍技術開発局) is a branch that is located in the. It was first mentioned by Mest, a former prisoner in it. It was described by him as "a living hell".

However, as the name suggests, it is a research facility. It utilizes captured pirates and what the Marines consider "good specimens" to test medicine, drugs and conduct physical and chemical experiments.

Notable Personnel

 * Sasamaguro
 * Sevenbergen
 * Vanloon

Known Test Subjects

 * Mest

Trivia

 * G-4's number is a reference to the title of a scientific paper written by two of the members of Sixty Symbols, named "General second order scalar-tensor theory, self tuning, and the fab four". According to the writers, it is a reference to The Beatles, as the four members lived in the hometown of one of the writers. I also chose the number because it is associated with science in this way, science being also the field of action of these Marines.