I was Navy but was served with the Marines for 4 years.
Navy experience does not translate to Marine Corps expertise. Their job is much different than a sailor’s.
They don’t leave men behind and your life might depend on your buddy’s ability to pick you up and carry you to safety. They also need to carry a combat load plus, and be able to fight. Their requirements are not meant to exclude people, they are in place so they can do their job.
I was a sailor, and remained one, but spending 4 years with the Corps left me for a deep respect and admiration for my green brothers. Leave them alone and let them do their job.
My son is a corpsman and was deployed on a MEU. At 6’2” 180, he said he felt like a midget. The “average” Marine weighed 170, but the recon and weps were half again as big. He got to carry all the guys in his squads— by himself. He did all the training that they had even though it wasn’t required. He enjoyed it, especially the heavy weapons, but it tears a body up—literally.