Hemisphere Defense

The warfighter has changed.The mission remains.

Hemisphere Defense builds mission-oriented programs for the next era of American vigilance: persistent awareness, distributed infrastructure, and operational readiness across land, air, and sea.

Explore Programs View Paul Revere Program

The warning came first

The Watch

The warning came before the fight.

America has always depended on those who see first. On an April night in 1775, the country's defense began with a signal: lanterns raised in a church tower and riders carrying word ahead of the column. Hemisphere Defense is built on the same idea: detect early, signal clearly, and sustain the watch so decision-makers can act before arrival.

From lanterns to sensors. From riders to networks. The mission remains.

Hemisphere Defense

From the first watchmen to the modern warfighter, the mission endures.

About

A defense-programs company built for sustained missions

Hemisphere Defense (HAD) is a defense-programs company that shares executive leadership with Hemisphere Aerospace Investments (HAI). Government missions increasingly require persistent awareness, distributed infrastructure, and autonomous-systems support delivered at a lower manpower burden and sustained over time. HAD is built to identify those operational gaps and develop disciplined programs around them.

More on what Hemisphere Aerospace Defense does and the capability areas our programs are built around.

Domains

Awareness across land, air, and sea

The distributed warning network, modernized: persistent sensing and support infrastructure spanning every domain the mission crosses. How we work across land, air, and sea.

Illustrative image: a ridgeline sensing and support installation overlooking coastal approaches at first light.

Land

Distributed sensing · forward infrastructure · austere operations

Persistent ground-based awareness and support infrastructure for contested, remote, and mission-critical environments.

Illustrative image: a long-endurance uncrewed aircraft holding station above the cloud deck at dusk.

Air

Reach · ISR · communications relay · persistent observation

Air-domain programs focused on reach, sensing, communications, and autonomous systems support.

Illustrative image: an offshore sensing mast over dark open water at night, distant contacts on the horizon.

Sea

Maritime awareness · offshore infrastructure · sensor fusion

Maritime programs built for persistent awareness, distributed sensing, and lower-burden operational coverage.

Concept rendering: the AYDLL maritime awareness infrastructure platform on station at sea under breaking weather, with an uncrewed surface vessel and an aerial system operating alongside it.

Concept rendering: a network view of the AYDLL platform linking distributed sensors and autonomous systems across air, surface, and subsurface domains.

Built around the AYDLL platform

Flagship Program

Paul Revere Program

Persistent maritime awareness infrastructure for the modern watch.

The Paul Revere Program carries forward a simple American idea: warning before arrival. Built around the AYDLL platform, the program is designed to support maritime domain awareness, autonomous systems operations, modular mission capabilities, and government reach-back command.

Persistent maritime awareness
Distributed offshore infrastructure
Modular mission support
Autonomous systems launch / recovery support
Sensor fusion and communications relay
Government mission authority preserved
Contractor-operated infrastructure support

Government mission owners retain command, mission, intelligence, response, and engagement authority. Hemisphere Defense operates, maintains, hosts, and sustains the infrastructure. It is not a ship, a weapons platform, or a replacement for crewed assets.

Program Overview Visit the AYDLL Platform Site