Years ago, I was flying an Army OH-58A through one of the MOAs around Edwards AFB. The controlling agency for the MOA contacted us, and said there were some fast-movers launching, and asked if we would be OK with them attempting to do an "intercept" on us, for training purposes. I replied that it would be fine, and asked if they wanted me to make it easy for them, or give them a challenge... Without skipping a beat (but with laughter in the background), they replied "give 'em a workout, if you can."
So we dropped down to extreme low-level (unpopulated desert area) and began operating in our usual tactical mode – flying "nap of the earth" (as low as terrain and obstacles permit). That also meant that we slowed way down, as we began picking our way through the lowest part of the valleys, keeping everything except the main rotor below the level of the mesquite and hilltops.
Pretty soon, we saw (and heard!) a couple of fast-movers (I can't remember the type, but given the era, probably F-15s) go roaring up the valley, about a mile away from our track... They were clearly trying to find us along our last radar track. We found a night tight confined area with terrain on three sides, and ducked into it to see if they had spotted us. Pretty soon, they came roaring back down the valley, this time a little slower, like they realized they must have overflown us, and were now looking a lot harder.
As soon as they were well beyond us, we hightailed it for the top rim of the valley, following gulleys, washes, and anything that would mask us from them and provide terrain cover from their onboard radar. Just below the top of the ridgeline, we found a promontory we could mask behind, while still seeing them approach. Pretty soon the two jets came flying by, this time MUCH slower, well below us in the valley, and clearly befuddled. About that time, I got a call from the controller, asking if we were still in the area, and if we'd seen the interceptors. I told them I was looking right at them. Then one of the jet jockeys came on the radio, saying we were doing a good job of hiding from them...
I laughed, and asked if they wanted to know the tactics we were using. After all, the whole point of the exercise is that "steel sharpens steel" and to learn from each other, right? And I said we didn't get that many chances to play "air-to-air" with the Air Force guys...
Unusually for fighter jocks, they said "Yes," so we explained (without telling them exactly where we were) what we'd been doing. Pretty soon, they came over again, and this time they spotted us, and began to maneuver against us. For the next 20 minutes or so, they would try to maneuver such that they could dive on us with guns/missiles, and we would hop to the opposite side of the ridgeline (where they could no longer line up on us) or fly directly towards them (thus steepening their dive angle until they had to break off). Sometimes we would do both – jump over the ridge, then fly along the ridgeline towards them, forcing #2 to radically alter their attack sequence.
Now I realize that (in a real-world combat situation) they heat-seeking missiles likely could have made short work of us – if they could have gotten a lock-on. That was the point of forcing them to steepen the dive angle every time they made a run at us... They didn't have enough time to find us again, then initiate the dive and get stabilized for the "lock"... Had the fighters gone to altitude and dived on us, they could easily have locked on, but that would have also potentially made them vulnerable to AA fire. They could also have split up slightly, one on each side of the ridgeline, but "leaving your wingman" is apparently not just a bad thing in movies like "Top Gun" – it's a real thing...
Anyway, we had some fun, got some good training in, and helped our fellow service-members improve their tactics against helicopters. And it certainly broke up the monotony of a somewhat lengthy cross-country flight across some boring desert terrain... Good times!