Vision Blocks for Amphibious Vehicle Hatches

What original equipment manufacturers have the capability to provide transparent armor for vision blocks in an amphibious military vehicle?

DSIAC was asked to explore manufacturers capable of producing and supplying vision blocks for a gunner station hatch for amphibious tactical vehicles.  DSIAC used open sources to identify and contact U.S.-based, transparent armor manufacturers to determine abilities and interest of further discussions with the inquirer if the opportunity arose.  A list of such manufacturers was compiled and delivered to the inquirer.