Method #1
Assassinate henry by placing a c4 on the helicopter by either piloting the helicopter yourself or wait for the pilot to fly it away and blow it up

Method #2
Assassinate henry by crashing the helicopter 

Method #3
Assassinate Bryan by shooting the crate above him

Method #4
Assassinate Byran by placing a C4 on the printer and blowing it up

Method #5
Assassinate Benny by ramming him off the edge with a Dozer

Method #6
Assassinate Bryan and Benny with a sniper
