A primary advantage of Virtual Environment (VE) training systems over alternative training methods (e.g., classroom) is the ability to recreate the fidelity and realism of live training through the implementation of immersive experiences leveraging cues presented in all modalities. This approach allows for the creation of affective experiences that are more closely matched to the real world, increasing immersion and the potential for training transfer. Current VEs have traditionally included advanced visual and audio cues, but olfactory cues are either not incorporated or incorporated haphazardly. The effective integration of olfactory cues into virtual environments has the potential to significantly increase immersion by leveraging the strong emotional and memory associations with odors. These potential benefits of integrating scents into VEs have led designers to develop a battery of more realistic simulated scents although very little guidance is available to support the optimized integration. This paper discusses olfactory cue integration guidelines for VE training based on current olfactory research. The guidance that is presented is scoped in methods to optimize the effectiveness of VE training, and topics include presentation methods and timing for maintaining saliency, methods for leveraging scent to target specific training objectives, technology to control and deliver olfactory cues, and the utilization of specific types of odors to influence cognitive and psychomotor task performance and to elicit targeted emotional states. The guidance provided in this paper sheds light on important considerations when making decisions to apply scent in VE designs to create more realistic and immersive VE training.