Removable bridge glass and sealed portholes

Could American warships remove the glass from their bridge windows?

Yes; removable bridge glazing is recalled, while portholes could be welded shut to keep light in and water out.

American bridge glazing could be removed, with a New Jersey video recalled as an example of the securing locks. Portholes were also sealed, including by welding them shut. Keeping light from escaping was one reason for doing so. Keeping water out was another, linking the treatment of openings to both concealment and survivability.