Why do modern infantry companies have so few men? Because so many are needed in the support units.
So you would strip out the support units IOT provide the slots for your return to a WWII-era infantry company? Then who will work on those machines you rode into combat? Are you willing to have a much lower OR? Are you willing to give up the amount of CAS and other supporting arms you would normally receive? Are willing to put up with slower turn-around times for equipment turned in for repair/replacement?
If you were worth a chewed plug of tobacco as a commander, the answer to all those questions is "No." But that's what will happen when you play a zero-sum game with manning. I call it a zero-sum game because the services have mandated end strengths, you know this. At heart, your argument is based on wanting your cake and eating, it too. You want large companies of infantry with the same level of support (if not more) that you have currently. And as it always has, it boils down to how much tooth to how much tail.
Even if the Army decided to go back to 200+ man companies, it would have trouble filling them. As infantrymen, you and I both know it's a very hard life. There's no way to "church up" the infantry and make it sexy for the average teen-ager. Grunts don't fly aircraft, drive tanks, or fire cannons. The skill set a good grunt acquires has no correlation to civilian life, except for LEO and contractor. The infantry, as it always has, takes what it can get and does the best it can.
First of all, a large scale airdrop is cheaper in terms of support resources than a daily small resupply.
No, it's not. A large scale airdrop with multiple ships? Fixed wing aircraft need airfields to operate from. These airfields tend to be far away from the "front," if you will. This increases your fuel expenditure. The airfields also require constant upkeep, particularly the strip itself. Earlier you mentioned the cost of heliborne resupply as including support personnel. It takes more airmmen to keep a fixed wing aircraft in the air than it does Soldiers an army helo. Then there's the cost of the cargo chutes, pallets, and rigging that won't be coming back. You'll also need a suitable DZ to bring the loads in on, or do you plan on dropping it in the trees? You can expect to eat the cost of un-recoverable/damaged/destroyed supplies in either event. Earlier in this thread, the was a bit of a discussion on the lack of Airlift on the part of the USAF. Your "Muleborne" Battalion might be in desperate need of re-supply but the USAF might not have the air frames available. This points out another flaw in your MM example. The USAF wasn't an independant service in WWII. Today it is. In WWII the army told the airplanes where to go. Today, the USAF's answer is, "We'll think about it."
Helicopters on the other hand can operate in much more austere airfields/FAARPs, require fewer man hours for maintenance, and are much closer to the the unit being supported. Equipment used for sling loaded supplies are easily recovered and re-used, virtually all supplies are delivered intact and areas needed for LZ/PZ ops are much smaller than those required for cargo drops by fixed wing aircraft. Also the Army controls the aircraft, not an outside service. On the whole, helo resupply is much cheaper than fixed wing. And since the battalion is Muleborne, more supplies can be brought in at a time reducing the need for daily log birds.
The "cheapest" cargo A/C in the USAF is the C-130 and I based my estimation using this aircraft.
Mike