Unit 88:
Here are a few things that I know about the USMC -compare them to what you know about the PLAN Marines:
1. Physical Fitness - USMC like a 3 mile run in 24.5 minutes, 60 push-ups, 85 sit-ups, 18 pull-ups, 41 squat-thrusts, and a 300 metre sprint in 41 seconds in either 5 60 metre dashes or 6 50 metre dashes (I've forgotten which, but its to simulate the actions in the Rifle Squad assault), and a 9 mile forced much with full kit in (I think) 3 hours, including across obstacles and at the end of a 54 hour "Sickener-type" exercise.
2. The USMC organizes itself into Marine Expeditionary Forces composed of at least one Marine Division (an MEF HQ can act in much the same way as an Army Corps HQ) and at least one Marine Air Wing (many, many squadrons and other units of fighter-bombers, attack aircraft, forward air control (FAC) aircraft, attack, assault, and transport helicopters, etc.) An MEF can organize Expeditionary Brigades (based on a Marine Infantry Regiment and part of a Marine Air Wing) and Expeditionary Units (based on a Marine Infantry Battalion and supporting Marine Air Wing Units), and possess heavy armour, tracked amphibious APCs and wheeled APCs, medium artillery, light and heavy anti-aircraft units, engineers, lots of reconnaissance troops, etc.
3. The USMC have a long and distinguished history in which their Regimental structure (not exactly the same as the British) helps to retain past lessons learned (unlike US Army and others in which Regiments are here today and gone tomorrow and their members scattered about). Marines often get to serve together for longer periods of time in the same unit, so they not only do not have to keep re-learning the basics, but they can go on to more advanced training and build up both experience and especially the sorts of personal relationships based upon professional trust and competence that make truly professional armies experts in war (and often good friends, or at least good comrades, in peace).
4. The USMC are well-trained by most standards. A US Marine infantryman receives around 20-21 weeks of recruit and infantry training, to fairly high standards of skill and physical fitness, and all must qualify as marksmen by successfully scoring on targets up to 400 metree with the M-16 A2 - something very few armies attempt anymore, if they ever did. Their battlecraft is superior to that of many armies (fieldcraft is sometimes another matter). USMC senior NCO's receive 5 weeks' hard squad and platoon leader's training in order to earn the right to lead Marines (and typically lose 30 or so pounds doing so on their NCO course), and new US Marine Infantry officers receive a full years' training, in addition to their academic development.
5. Their 13 man Rifle Squad is the envy of much of the Infantry world. Composed of a Squad Leader (senior NCO) commanding 3 identical 4 man Fire Teams (each with a light machine gun, grenade launcher, and 3 assault rifels and led by a junior NCO), it is very capable. By the way, Fire Teams were pioineered by the USMC, and allow Rifle Squads/Sections to use fire-and-movement with (potentially) tight control. It has the numbers to take heavy losses and make assaults, heavy firepower to force the enemy to go to ground and stay there, good officers and often excellent (and plentiful) NCOs to led often well-trained and disciplined Marines. And this continues upwards.
Compare what you know of the PLAN Marines to this.