Skyhawk 172/Cutlass 172
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Sea
Flight Crew Last 90 Days 250; Flight Crew Total 3700; Flight Crew Type 500
Situational Awareness
Conflict NMAC
Flight Crew Took Evasive Action
Airport; Human Factors; Airspace Structure
I took a student to GCC to solo at the tower [controlled airport]. [Student] soloed there and we headed back home [north]. I checked the NOTAMs for the airspace [Powder River 2L MOA]; in which it was active but not any different than the other times I have flown through it. On the way back; at Lat/Long 45.81°/104.61° we were approached with oncoming traffic at our 11 o'clock. We then talked about what to do in this situation. Since we had no radio contact or radar we decided to descend in case there was more military aircraft at that altitude. We descended to what we thought was a safe altitude as a military bomber crossed over head. Upon reaching our new altitude the bomber came back over top of us approximately 100 feet to 200 feet above us. It caught my student and myself off guard being that close to us and out of nowhere a bomber departing to our 11 o'clock to the Northwest when just minutes before came from Northwest headed to the southeast. So I reached to back seat to grab phone to take picture by which time plane was too far away. We were a little shook up not knowing if they had even seen us and or if it was intentional. But at the very least made us both feel very unsafe; especially after we took corrective action.
C172 instructor pilot reported a NMAC with a military bomber at 4500 feet while passing through the active Powder River 2L MOA.