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Firing anti-tank weapons indoors can be very hazardous. Avoid doing so when possible as the backblast can kill or seriously injure you due to the restrictions of the structure.
Soft-launch weapons like the Javelin or NLAW can be safely fired out of an enclosed space, but RPGs, AT-4s, SMAWs, and other common hard-launch anti-tank weapons cannot.
Use a firing position that provides:
When preparing to make an anti-vehicle shot, quickly scan the surrounding area while loudly declaring others to "Clear backblast!". The scan is intended to give visibility on who or what may be behind the launcher and help visually verify that the backblast area is clear of friendly personnel.
Declare "Backblast clear!" to let the gunner know that they are able to safely fire, after clearing the danger area by visually scanning it.
Upon hearing "Backblast clear!", or having visually confirmed that the area is clear, confirm the sight picture, loudly declare "Rocket!" and then fire the weapon.