no but we have played around with using the c-17 as a launch platform for Nuke capable missiles and Rockets bound for space. Its kind of like dropping a MOAB. Instead of the payload free falling to the ground the missile lights engines and heads to the stratosphere.
I want to cross train to missile maintenance because most of the active duty c-17 bases pretty much suck location wise. If i was missiles id be in Montana, Wyoming, Idaho, Utah etc. That or go SERE instructor.