Short answer
Military and radar siting constraints are limits on what you can build near military installations, training airspace, and radar systems. For data centers, the risk usually comes from tall structures such as stacks, cooling equipment, transmission lines, and on-site generation, plus land use compatibility near bases. Screen early by checking proximity to installations and special use airspace, filing with the FAA where height rules require it, and using the Department of Defense (DoD) Siting Clearinghouse for informal early review when a site is close to military activity.
Key terms
DoD Siting Clearinghouse: the Military Aviation and Installation Assurance Siting Clearinghouse, the DoD office that reviews proposed projects for effects on military operations and readiness and can provide early informal feedback.
FAA obstruction evaluation: the FAA process (Form 7460-1 notice) for structures that meet height or proximity criteria. DoD reviews these filings for military impact.
Special use airspace and military training routes: airspace used for military flight activity where low or tall obstacles can be a concern.
Compatible use planning: community and installation plans that guide what land uses fit near a base. Some localities adopt overlay zoning based on them.
Why it matters for data centers
Data center campuses are getting larger, and many now include on-site generation, substations, and tall equipment. Sites near bases, test ranges, or radar facilities can draw objections or mitigation requests late in the process. Finding that after land control is expensive. Finding it during sourcing is cheap.
The screen
| Check | What to look for | Outcome |
|---|---|---|
| Installation proximity | Distance to bases, ranges, and military airfields | Flags sites for early review |
| Airspace | Special use airspace and training routes over or near the site | Informs structure height limits |
| Radar | Proximity to air defense, weather, or air traffic radar | Flags line-of-sight or interference concerns |
| Local overlays | Military compatibility zoning or base-related ordinances | Can restrict use, height, or lighting |
| Tall elements | Stacks, towers, cranes during construction, transmission lines | Determines FAA filing needs |
Decision rules
Near a base, ask early. If a site sits close to an installation or under training airspace, request informal Clearinghouse feedback before heavy diligence spend.
Height drives filings. Inventory every tall element, including construction cranes, and file where FAA criteria apply.
Read local overlays. Military compatibility zoning can be stricter than base zoning and is easy to miss.
Plan for mitigation, not just yes or no. Outcomes can include height limits, lighting changes, or design adjustments. Build them into the concept.
Separate this from civil airspace screening. Airport height rules and military concerns overlap but are not the same review.
Red flags
Site under or adjacent to military training routes or special use airspace
Local zoning references base compatibility or accident potential zones
On-site generation stacks or towers planned without a height inventory
No record of FAA filing for structures that likely meet notice criteria
How Build approaches it
Build sources sites and validates them against the constraints that kill deals late, including airspace and military proximity, before you commit diligence budget. The sites you get come with these flags surfaced, so your team knows which ones need early federal review. Build then helps bundle the specialist services needed to take a validated site from shortlist to usable land.
Checklist
Distance to nearest military installation and range recorded
Special use airspace and training routes checked
Nearby radar facilities identified
Local military compatibility overlays reviewed
Tall element inventory completed, including cranes
FAA filing needs determined
Informal DoD Siting Clearinghouse review considered