This review describes the state-of-the-arttechnologiesthat support mental resilience training for PTSD prevention. It characterizes four current systems across training approaches; seeks insights via interviews with the systemdevelopers; and extracts from thesea set of essential guidelines for future developers. The guidelines include four distinct project-limiting factors, which were found to constrain the reviewed developments. These were Culture, Effectiveness, Engineering, and Resource constraints.This research is novel in reviewing technologiesfor PTSD prevention as opposed to treatment, and in analyzing from the perspective ofsystem development and designissues.