Before you left Wardog, he gave you this photo as his last memento. It is of a school, most likely the one where he taught. It reminds you of an experience called...
Blood of Tyrants
It was the last moments of Wardog's major plan to unleash a Neutron bomb within Nova Praetoria. Things had gone poorly, however; the PPD T.E.S.T. cornered you, Vagabond, and Wardog in the tunnels underneath Nova Praetoria. It was here that you were faced with a choice: fight through the PPD TEST and activate the bomb, killing the entire squad heading down into the tunnels along with Vagabond and Wardog, or betraying the two members of the Resistance to disarm the bomb yourself, earning yourself the title of 'Hero of Praetoria'.