What combat rating does the navy have?

Currently, the only two ratings that are officially considered to be "Combat Ratings" (no female allowed) are SO (Special Warfare Operator aka Navy SEAL) and SB (Special Warfare Boat Operator aka SWCC or Swick). With other ratings such as EOD, HM (FMF) / SARC (not an actual rating), and SEABEEs have higher probability than most other sailors of seeing some combat situations, but they do not considered to be "Combat Ratings." No rating is going to "guarantee" you that you will be in a combat situation.