Hi mate,
Rather impossible. You’r way of thinking is modern. Try to think WWII, not today. Either repairing or manufacturing boots in Europe by civilian contractors was impossible due to the lack of leather on the market.
Here a bit of explanation:
"After two trips to the shop for resoling, the Army shoe becomes unserviceable, although the upper is generally still in good condition. As a result, in June 1942 the Quartermaster Corps inaugurated a shoe-rebuilding program through leasing one plant and contracting for the services of another. Later similar facilities were provided overseas.
Overseas operations largely resemble those within the continental United States. Base shops have been established to handle major repair and to take care of the overflow from the mobile shops in the field; these are operated by civilian personnel, recruited and trained from the native population. On the other hand, field work is accomplished mainly by the mobile shoe repair shops, which move with the troops and are manned by military personnel.
In Rome, two American corporals with the aid of ten civilian Italian cobblers are repairing more than 4,000 pairs of shoes a month for Army personnel. In the Marianas, trailers of a Quartermaster Mobile Repair Company are returning to service every month more than 10,000 pairs of shoes for the Army, Navy, Marine Corps, and Seabees at an estimated saving of 30,000 square feet of leather."
Source: http://www.qmmuseum.lee.army.mil/WWII/shoes_and_the_army.htm
So we proved that even re-soling was responsibility of the Army.
And nice photo of “ammo boots”:

More you can find here:
http://www.drillpad.net/DI_AF_Taps.htm
The cleats on our artilleryman boots were probably done by inventive divisional cobbler. The whole trick is that we think in todays terms - boots are worn, go to quartermaster and get new ones. It was not the case in WWII even in US Army - re-soling and repairing was common.
Cheers,
Lancer44