The following is based on Van Buren and has not been confirmed by canon sources.
HERMES armor, developed by a division of Poseidon Energy working in conjunction with the Department of Defense, was intended to be the next generation of combat armor used by elite light infantry troops. In theory, it was to offer all of the protection of power armor without the cumbersome weight or Strength enhancements.
Hermes in the Greek mythology is the messenger of the Gods of Olympus who always traveled fast and light, hence the reference on the armor's name.
Hermes was the Greek god of commerce, thieves, travelers, sports, athletes, border crossings, fish, etc., as well as the messenger of the gods. In addition, he was the guide for souls to the Underworld.