Abstract: Protection, signature management and survivability are considered fundamental for any military capability system. These three concepts must be clearly defined and the dependencies among them well understood due to their importance to equipment acquisition, operational planning, training and doctrine development. The unambiguous interpretation of their intent is essential for the operation and successful integration of capability systems up to joint task force level. Such considerations apply equally to the deployable protected vehicles of the Australian Defence Force, especially the soon to be acquired Protected Mobility Vehicle—Light (PMV-L) fleet. In this article deficiencies in the existing definitions of the three concepts are overcome and their relationships are analysed using system and process modelling in support of the considerations.