Well, I provide some short dialogue and action to show how he came to be positioned that way.
"Ahh!"
Mr. Soldier backs up, pumping his arms backwards as he drags his feet away from the pursuing zombie, which had managed to infiltrate his tank.
"Get away from me, ye vile beast!" cried Mr. Soldier, lashing out as the zombie with his foot. However, this only served to enrage the shambling undead, and it quickened it's pace. At last, Mr. Soldier's back touched the cold, damning steel of his tank's hull; there was nowhere else to go. Before Mr. Soldier could even pull out his pistol, the zombie was upon him, and sank it's teeth into his neck. Suddenly, the zombie decided he didn't like the taste of Mr. Soldier, and withdrew from the tank to go on his merry way. Meanwhile, Mr. Soldier, laid where he had been bitten, slumped against the hull, moaning as the fever overtook him.
That work?