The US air campaign against Iran is running out of momentum, and the conflict is unlikely to shift decisively without a major escalation, including the deployment of ground forces, Politico reported, citing experts and sources. Politico said no signs of a US military buildup in the region have emerged that would indicate preparations for a ground operation. The number of US troops and military assets in the region has remained roughly unchanged since the campaign began in February. Retired US Air Force Judge Advocate Rachel VanLandingham said that expanding or intensifying strikes against Iran's civilian infrastructure would not change Tehran's policy. "Even if these strikes that are expanding to greater numbers of civilian infrastructure targets are lawful, they’re ineffective," she said.