Retrofit optical turret with laser source

A retrofitted optical sight cluster system comprising:

• a turret support structure defining a lower turret area and upper turret area sealed from the lower turret area;
• optics mounted onto the turret support structure including
• a gimbal mounted optics assembly for providing an image of an outside scene viewed through a window;
• and
• a relay optics assembly fixedly mounted on the turret support structure for transmitting said image in a first direction along an optical path extending through the upper turret area to an operator's eye;
• a laser source mounted in said upper turret area;
• and
• means for diverting the radiation output of said laser source so as to pass along at least a portion of said optical path from the upper turret area to the lower turret area in a second direction opposite to the first direction, said means for diverting including means for causing the radiation output of the laser source first to pass along said optical path, then to depart therefrom and finally to rejoin it.