And people here and elsewhere wonder why I continue to advocate for increased defense spending despite having no stake in it whatsoever.
This is largely aimed at those that do not know.
Simple fact, at most times 50% or less of US military equipment is "combat ready". And that is on purpose.
It takes a lot of time and money to keep equipment combat ready. And that money is only put in shortly before it is needed. And in the event that something breaks, the units on deployment or about to go on deployment get the highest priority for repairs and parts.
I actually did this for years, being the Battalion Maintenance Chief for my Infantry Battalion. And there are several levels of priority, depending on the equipment, what is wrong with it, and where a unit is in the activity status. But in general, there are 3. Top, for units in combat or deployed. Second, for those about to deploy. And last, those who are not deployed or expected to deploy any time soon.
For example, stateside after a summer of usual training, a unit is at the next to lowest levels (the lowest being the reserve units). So something like a hand guard or butt stock for an M-16 is priority 13. But the bolt for an M-2 heavy machine gun would be a 3, as it is considered to be combat essential.
If a unit is preparing to go overseas, that goes up by 1. So the M-2 bolt would be a priority 2. A unit that is deployed or in a combat zone would have a priority of 1. And the M-16 parts would be priority 11.
Units that are in an active status get the top priority. And those that are largely "in garrison" are towards the bottom. That is simply how things are. That is why there is a system in place to allow units to scrounge from one piece of broken equipment to keep another one functioning. Hence, most motor pools will have a vehicle with almost everything broken. Because it sometimes is a long wait to get parts if you are simply in a garrison status in the US.
In the Infantry, I saw the priority change depending on our operating tempo. If a unit had just finished a 6 month deployment, they are going to be home for at least a year. So there is no rush to get their stuff fixed. Plenty of time to get all the broken stuff fixed, and after the year as they prepare to deploy again, their priority is moved up to help make sure that everything is fixed and ready again before they go.
And if something can't be fixed, then it is replaced from ready to use war stocks.
When I was in PATRIOT, it was the exact same thing. We often times had launchers or a RADAR system down for months in the US, as the priority of the repair system was getting the parts sent overseas where they were actually on a mission. Those in the US, not so much. And that readiness level is also adjustable depending on the US alert status as a whole. If we were to have to go to a wartime footing, then everybody would ramp up their priorities, and get parts a lot faster.
The only large exception is the Reserve and Guard. For the most part, they are not expected to have to fight with their current equipment anymore. That is largely for training purposes, if they were to go to combat they would largely fly out and meet up with staged and pre-deployed equipment that is constantly maintained. When I was in a Reserve medical unit, not a single piece of our equipment other than weapons worked. It did not need to, it was only for training. If we had to go to say Germany or Kuwait, we would arrive there and all working equipment would be waiting for us to use. We have entire warehouses that is literally full of broken equipment, only used for training.
That is why if somebody in a medical reserve unit is injured in field training, they are sent to the base hospital. Their equipment is real world and actually works.