WASHINGTON, Sept 17 (Reuters) - The Pentagon official

overseeing President Donald Trump's Golden Dome missile defense

effort, Steve Feinberg, was on Wednesday set to receive his

first official briefing on the architecture of the complex, $175

billion plan.

The briefing is a key milestone for General Mike Guetlein,

who is in charge of the day-to-day progress for Golden Dome, and

signals planning, funding and development for the most ambitious

defense effort launched by Trump is taking shape.

"Sept. 17, 2025 marks 60 days since Gen. Guetlein's

confirmation and the establishment of the Office of Golden Dome

for America," a Pentagon spokesperson said. "The Department of

War met the deadline of initial architecture development."

Two sources said that Guetlein had briefed Congress on

Monday on Golden Dome's goals and schedule.

According to government presentations previously reported by

Reuters, the system would feature space-based sensing and

targeting capabilities alongside ground-based missile

interceptors, radar arrays and potentially laser systems.

The sources said Guetlein's briefing on the architecture was

not expected to include details on the number of satellites or

interceptors needed for Golden Dome.

The Golden Dome initiative faces an ambitious 2028 deadline

set by Trump, with the system intended to defend against

ballistic, hypersonic, and advanced cruise missiles from

multiple adversaries.

The proposed architecture includes four integrated layers -

one satellite-based and three land-based - with a notional 11

short-range missile batteries positioned across the continental

United States, Alaska and Hawaii.

The next milestone is around mid-November, when Guetlein

must present a full implementation plan with satellite and

ground station details.

The program draws inspiration from Israel's Iron Dome, but

operates on a significantly larger geographic scale. Major

defense contractors including Lockheed Martin ( LMT ), Northrop

Grumman ( NOC ), RTX and Boeing ( BA ) are expected to

compete for various system components.