One of the final missions in Operation Flashpoint: Cold War Crisis, called "Search & Destroy".
The goal is to destroy a heavily defended SCUD launcher before it can launch a nuclear missile. You can call in air support, but the enemy has AAA which shoots it down. You can call in tanks, but there are far too many enemy units for them to deal with. I had to try at least ten times and I only eventually succeeded because a friendly helicopter supporting me crash landed on the target, blowing it up...
The goal is to destroy a heavily defended SCUD launcher before it can launch a nuclear missile. You can call in air support, but the enemy has AAA which shoots it down. You can call in tanks, but there are far too many enemy units for them to deal with. I had to try at least ten times and I only eventually succeeded because a friendly helicopter supporting me crash landed on the target, blowing it up...