This Tuesday INSIDER Daily Digest has news on Guam missile defense, Marine Corps efforts to integrate unmanned aircraft into operations, submarine construction and more.

We start off with news on efforts to protect Guam from ballistic missile attack:

Pentagon: Guam Defense System on track as bulk of architecture slips to 2027-2028

The Pentagon's top acquisition official for the Guam Defense System told Congress the $8 billion effort to provide 360-degree integrated air and missile defense for the Western Pacific island remains on schedule and on budget, even as the bulk of the architecture will not begin flowing to the U.S. territory until 2027 and 2028 -- a year or more behind the original target a previous U.S. Indo-Pacific Command chief set in 2020.

Marine Corps officials spoke about the service's recently released 2026 Aviation Plan:

Marine Corps outlines plans for CCA integration

As part of an effort to further integrate unmanned aircraft into operations, the Marine Corps' version of the Collaborative Combat Aircraft is set to begin operational testing in 2029, an official said last week.

Document: Marine Corps 2026 aviation plan

HII's CEO spoke about Navy submarine construction this week:

Submarine contract negotiations on track, HII CEO says

Following delays, pending multiship contract awards for 15 nuclear-powered submarines are expected in the second quarter of 2026, HII CEO Chris Kastner told investors today.

A new 'Right to Integrate' hackathon is an Army-industry partnered sprint that will ensure offensive and defensive weapon systems, and business systems across the service, can collectively integrate, share data and communicate with each other:

No more 'swivel chair': Driscoll launches 'hackathon' sprint to link sensors and shooters

A new "hackathon" sprint series will bring in experts from several defense companies to break into current Army sensing and shooting systems and open them up to link across an all-encompassing architecture.

Prime contractor Boeing -- which is also in charge of the Radar Modernization Program for the B-52 bomber -- will modify two B-52Hs at its San Antonio facility:

B-52 engine replacement program completes CDR, plans to modify test aircraft this year

The B-52 Commercial Engine Replacement Program completed its critical design review, the Air Force announced today, and the first test plane is expected to begin modification this year.

Cybersecurity and artificial intelligence coverage:

FDD urges U.S. to take offensive cyber measures against China-developed AI military robots

The Foundation for Defense of Democracies is urging federal policymakers to take steps to identify and exploit vulnerabilities in robotic systems being tested for combat by the Chinese People's Liberation Army.

Sacks says as other AI firms catch up on cyber capabilities, 'it's time to demystify Mythos'

David Sacks, the influential co-chair of the White House Council of Advisors on Science and Technology, took aim at assertions that the federal government needs access to Anthropic's Mythos frontier AI model amid an ongoing legal battle with the Defense Department, saying rival developer OpenAI has already caught up with the Mythos cybersecurity capabilities and others will do so shortly.