If your sergeant can see you, so can the enemy. The most dangerous thing in the combat zone is an officer with a map.
Incoming fire has the right of way.
Never share a foxhole with anyone braver than you are. No battle plan ever survives contact with the enemy. The problem with taking the easy way out is that the enemy has already mined it. The further you are in advance of your own positions, the more likely your artillery will shoot short. If your advance is going well, you are walking into an ambush.