New Recruit
At level 2, you've hand selected a recruit from the Marine ranks. You may grant them any weapon proficiency as long as it is for a specific type of weapon (Katana, Tonfa, etc), or Medium Armor proficiency. Additionally you may grant them one additional skill proficiency for any skill, vehicle, or tool.
Academy Training
Marine Officer followers have more training and are better equipped than the run of the mill recruit. At level 7, your follower immediately gains an Academy Training Follower Feature of your choice and each time they would gain any future follower features, they gain an additional Academy Training Follower Feature.
Fire Power
At level 13 your follower can now benefit from the Battle Plan feature. Additionally you and your follower do not need to target the same creature for Battle Plan to take effect.
Unwavering Resolve
Faced against the lowest scoundrels of the sea Marines stand steadfast against all odds. At level 17 you and your followers become immune to the fear condition. Additionally you and your follower have advantage on Saving Throws against acquiring and recovering from all Mental Status Conditions.