You have it here and with 25 000 combat troops ideally 30000 with the new ratio you get 75000 support which includes a wide range of services that can be outsources in some cases but anyway it gets close to 115000 altogether.
http://www.stripes.com/news/middle-east/centcom-us-iraq-mission-to-take-back-mosul-to-launch-in-april-or-may-1.330664