9-10-2020 Update.  Two additional resources that may prove to be extremely informative are the following:

Defense Pricing and Contracting Memorandum on Base Operations Support Services and the Defense Contingency Contracting Handbook.  The EUCOM Operational Contract Support site might have some good information as well.  Also, there is some NATO involvement so their contracting site could be beneficial as well.

Based on the information provided in the question below I would suggest the Contracting Subway Map as a starting point. It is an interactive guide to acquisition contracting process with templates, guides and forms.  To access the Contracting Subway Map go to www.dau.edu.  On the top left had corner there is a drop down menu.  Select tools, then scroll down the page to the Contracting Subway Map, click and launch.

Hope this is helpful.