Recreational / Hobbyist UAS pilot reported they had a near miss with a military helicopter during a training flight and took evasive action.

Narrative

I was flying legally at 120 ft. above the tree tops outside of Class C when two alerts popped up on my screen saying that aircraft were approaching at the same altitude. I quickly turned the UAS around and spotted a Blackhawk at 500 ft. which went to my east based on the way I was facing. The other I spotted at the same altitude approaching fast. I was headed to my landing spot but would have had to climb to around 300 ft. due to terrain even though the drone was in visual line of sight the whole time. I made the decision that this was an emergency and it was safer to try and put the drone as close to the tree tops without crashing and hope that they didn't lose altitude. The UH-71 flew directly over my drone with maybe 250 ft. separating my drone. I caught all of this on 4K recording which I have saved for evidence if there is ever any question. The UH-71 should have been able to easily spot my drone and take action to avoid the possible collision. I was prepared to crash my drone into the trees if needed but that could have caused a forest fire which would have put the nearby homes and residents at risk. My drone is registered and I hold a TRUST certificate. I run nav lights visible for 3nm and checked NOTAMs; Weather and logged my location.