The phrase "help with mission" is correct and usable in written English.
You can use it when referring to someone helping to accomplish a task. For example, "The team worked together to help with mission."
Some gadgets help with missions.
If you need help with missions don't go around asking players how to do them.
Get some gear To be a good spy, you and your friends must have gear that will help with missions.
Cable meets with his commanding officers, Captain George Brackett and Commander William Harbison, who plan to ask Emile to help with the mission because he used to live on the island where the mission will take place.
Increasing the number of conventional troops will not help with this mission.
"If this is going to be a sneer piece, it won't help with our mission," he said.
Britain has also sent one RAF Sentinel surveillance and reconnaissance aircraft to Senegal to help with the mission.
I help with the mission's food parcel scheme when it runs from October to June, shopping and helping pack on a Thursday, distributing the food on a Friday.
To help with that mission, the company has raised further funding.
