A monitoring system for a military vehicle 2 is provided. The military vehicle 2 comprises one or more vehicle control systems (20, 22 in Figure 4). The monitoring system comprises: a user interface/controller 42 for facilitating interaction between a user 4, 6, 8, 10 of the military vehicle 2 and the one or more vehicle control systems 20, 22； and one or more sensors 40 for use in monitoring a condition of a user 4, 6, 8, 10 of the military vehicle 2. The user interface 42 is arranged to use a monitored condition of a monitored user 4, 6, 8, 10 to facilitate selective interaction between the monitored user 4, 6, 8, 10 and the one or more vehicle control systems 20,22.
