1. An augmented reality system, comprising: a physical environment; a headset for mounting to a trainee having eyes with a normal visual field; binocular cameras mounted to the headset so as to supply a first source of binocular video feed of the physical environment, corresponding to a normal visual field of a trainee; a binocular display mounted to the headset and connected to a second source of binocular video feed to provide binocular imagery to a trainee, wherein the second source of binocular video feed comprises a composited video combining the first source of binocular video feed of the physical environment with a third source of binocular feed comprising video game imagery which replaces portions of the first binocular video feed of the physical environment, so that the video game imagery and parts of the physical environment are displayed without substantial overlap; a weapon simulator for carriage by a trainee, including a laser which projects a laser beam on to the physical environment.