Steve Casapulla, an infrastructure security executive in the Cybersecurity and Infrastructure Security Agency, is being detailed as the assistant national cyber director for policy in the White House’s cyber office, prompting a slew of leadership shifts inside CISA, sources tell Nextgov/FCW. With Casapulla pivoting to the Office of the National Cyber Director, Scott Breor — an associate director for the agency’s security programs — will take up …