See e.g. https://www.cbsnews.com/news/trump-possible-reduction-us-troops-germany/

"The United States is studying and reviewing the possible reduction of Troops in Germany, with a determination to be made over the next short period of time," he wrote on Truth Social. 

Resolution is based on announcement. It does not matter if the announcement is then folllowed through. Only unequivocal announcement counts, so e.g. saying that number of troops will be reduced unless Germany does something will not count.

Only active duty troops count.

More than 36,000 active duty troops were assigned to bases throughout Germany as of last December