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The free offering merely requires would-be callers to add and validate their .mil email addresses in Gmail. Then they can click the "Call phone" link in the Chat sidebar to initiate a call via Gmail's dial pad.
"We recognize and appreciate the sacrifices U.S. troops make when they serve abroad, and we’re proud to help make it a little bit easier for them to stay connected and hear a familiar voice," Ilya Frank, Senior Software Engineer at Google, says of the company's decision.