I have never known the exact reason for the yellow circle on the armour plate behind the pilot’s head.

The FN121 tail turret fitted to the Lanc has two pieces of armour. One piece that is approx. 15″ square and mounted between the centre upright frames, just in front of the gunner’s lower legs. The gunner’s oxygen economiser mounted in front of it!

The other piece (approx. 8 x 12″) was strapped just underneath the gunner’s seat cushion.

I discovered recently on one of the turrets I’m working on that the main armour plate also has a 3″ dia. yellow circle painted on it. Only visible from the inside of the turret.

I would love to hear the story behind this.