A safety device for use with a munition, the munition including a munition explosive and a safe and arm (S&A) device for activation of the munition explosive, the safety device comprising: a switch member, configured for being disposed between the munition explosive and the S&A device, said switch member being movable between at least two switch positions including: - a first switch position, being an arming prevention position, in which arming communication between the munition explosive and the S&A device is prevented; and - a second switch position, being an arming enabling position, in which arming communication between the munition explosive and the S&A device is allowed; an actuation mechanism for selectively moving said switch member at least from said APP to said AEP to thereby enable the S&A device, when armed, to detonate the munition explosive via the switch member; said switch member comprising a marker element, wherein the marker element is configured for providing an externally observable indication corresponding to the switch member being in at least one of said switch positions; - wherein the marker element is configured for providing said externally observable indication correspondingly relating to at least one of the following: that said switch member is at said APP concurrent with said switch member being at said APP; - that said switch member is at said AEP concurrent with said switch member being at said AEP; - that said switch member is at said APP concurrent with said switch member being at said APP; and that said switch member is at said AEP concurrent with said switch member being at said AEP; a lock mechanism for reversibly or irreversibly locking the switch member at the AEP after it has moved from the APP, characterized in that said marker element comprises a rod member that is deployable from a retracted position, in which the rod member is not externally observable, and a deployed position, in which the rod member is externally observable. a switch member, configured for being disposed between the munition explosive and the S&A device, said switch member being movable between at least two switch positions including: - a first switch position, being an arming prevention position, in which arming communication between the munition explosive and the S&A device is prevented; and - a second switch position, being an arming enabling position, in which arming communication between the munition explosive and the S&A device is allowed; - a first switch position, being an arming prevention position, in which arming communication between the munition explosive and the S&A device is prevented; and - a second switch position, being an arming enabling position, in which arming communication between the munition explosive and the S&A device is allowed; an actuation mechanism for selectively moving said switch member at least from said APP to said AEP to thereby enable the S&A device, when armed, to detonate the munition explosive via the switch member; said switch member comprising a marker element, wherein the marker element is configured for providing an externally observable indication corresponding to the switch member being in at least one of said switch positions; - wherein the marker element is configured for providing said externally observable indication correspondingly relating to at least one of the following: that said switch member is at said APP concurrent with said switch member being at said APP; - that said switch member is at said AEP concurrent with said switch member being at said AEP; - that said switch member is at said APP concurrent with said switch member being at said APP; and that said switch member is at said AEP concurrent with said switch member being at said AEP; - wherein the marker element is configured for providing said externally observable indication correspondingly relating to at least one of the following: that said switch member is at said APP concurrent with said switch member being at said APP; - that said switch member is at said AEP concurrent with said switch member being at said AEP; - that said switch member is at said APP concurrent with said switch member being at said APP; and that said switch member is at said AEP concurrent with said switch member being at said AEP; a lock mechanism for reversibly or irreversibly locking the switch member at the AEP after it has moved from the APP, characterized in that said marker element comprises a rod member that is deployable from a retracted position, in which the rod member is not externally observable, and a deployed position, in which the rod member is externally observable.