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SpaceUnited States

Proliferated Warfighter Space Architecture (PWSA)

Military LEO data transport and missile tracking constellationIn developmentPending verification

Also known as: SDA Tranche, Transport Layer, Tracking Layer, PWSA

SpaceUSA
Proliferated Warfighter Space Architecture (PWSA)
Photo: Airman 1st Class Spencer Contreras, U.S. Space Force / DVIDS · Public domain, DVIDS
Fact cardConfidence · Source
System
TypeMilitary LEO data transport and missile tracking constellation
Alternative designationsSDA Tranche, Transport Layer, Tracking Layer, PWSA
ProliferationOrigin country only
First launch2023Med[1]
Satellites27Tranche 0: 19 transport and 8 tracking (demonstration)Med[1]
Planned satellites154Tranche 1: 126 transport and 28 trackingMed[1]
ContractorsYork, Lockheed Martin, SpaceX, L3Harris, Northrop Grumman (Tranche 2)Med[1]
Program statusFirst 42 Tranche 1 transport satellites launched Sept–Oct 2025; launches resumed July 2026 after a nine-month pause; 36 Golden Dome tracking satellites awarded July 2026Med[1]
Dimensions and weight
Mass227 kg500 lbAbout 500 lbMed[1]
Orbit
Orbit regimeLEOMed[1]
Catalogued on orbit63Payloads with current element sets in the public catalog, active or not. Objects named PRAETORIAN SDA_ (L3Harris/Lockheed Tranche 1 tracking and transport) and SDA-NG-T1TL (Northrop Grumman Tranche 1 transport).High[2]
Active (CelesTrak)63Count in the CelesTrak active satellites list, which estimates operational status.Med[2]
Perigee930–950 kmActive satellites per CelesTrak, element epoch about 2026-11-08.High[2]
Apogee948–959 kmActive satellites per CelesTrak, element epoch about 2026-11-08.High[2]
Orbital period103.9–104.1 minActive satellites per CelesTrak, element epoch about 2026-11-08.High[2]
Inclination81.3–81.5 °Active satellites per CelesTrak, element epoch about 2026-11-08.High[2]
Catalogued satellites · 63[2]
NameNORADCOSPARPerigee kmApogee kmIncl. °Period minStatus
PRAETORIAN SDA_602655652025-203A94695581.3104.1Active
PRAETORIAN SDA_603655662025-203B94395781.3104Active
PRAETORIAN SDA_604655672025-203C94995781.31104.1Active
PRAETORIAN SDA_605655682025-203D94795981.3104.1Active
PRAETORIAN SDA_606655692025-203E94895781.31104.1Active
PRAETORIAN SDA_607655702025-203F94495781.3104.1Active
PRAETORIAN SDA_608655712025-203G94695581.3104.1Active
PRAETORIAN SDA_609655722025-203H94495481.31104Active
PRAETORIAN SDA_610655732025-203J94695681.3104.1Active
PRAETORIAN SDA_611655742025-203K94895681.3104.1Active
PRAETORIAN SDA_612655752025-203L93995381.3104Active
PRAETORIAN SDA_613655762025-203M95095881.3104.1Active
PRAETORIAN SDA_614655772025-203N94295281.3104Active
PRAETORIAN SDA_615655782025-203P94195581.3104Active
PRAETORIAN SDA_616655792025-203Q94895681.31104.1Active
PRAETORIAN SDA_617655802025-203R94795881.3104.1Active
PRAETORIAN SDA_618655812025-203S94295681.3104Active
PRAETORIAN SDA_619655822025-203T94595781.3104.1Active
PRAETORIAN SDA_620655832025-203U94795881.3104.1Active
PRAETORIAN SDA_621655842025-203V94595681.3104.1Active
PRAETORIAN SDA_601655852025-203W94995781.31104.1Active
PRAETORIAN SDA_5011000592026-163A93695381.48103.9Active
PRAETORIAN SDA_5021000602026-163B93495381.49103.9Active
PRAETORIAN SDA_5031000612026-163C93295481.48103.9Active
PRAETORIAN SDA_5041000622026-163D93695481.48103.9Active
PRAETORIAN SDA_5051000632026-163E93395481.48103.9Active
PRAETORIAN SDA_5061000642026-163F93195381.48103.9Active
PRAETORIAN SDA_5071000652026-163G93695481.49103.9Active
PRAETORIAN SDA_5081000662026-163H93595481.48103.9Active
PRAETORIAN SDA_5091000672026-163J93595381.48103.9Active
PRAETORIAN SDA_5101000682026-163K93695481.48103.9Active
PRAETORIAN SDA_5111000692026-163L93495381.48103.9Active
PRAETORIAN SDA_5121000702026-163M93395481.48103.9Active
PRAETORIAN SDA_5131000712026-163N93695481.49103.9Active
PRAETORIAN SDA_5141000722026-163P93795481.48103.9Active
PRAETORIAN SDA_5151000732026-163Q93295481.48103.9Active
PRAETORIAN SDA_5161000742026-163R93095381.48103.9Active
PRAETORIAN SDA_5171000752026-163S93195381.48103.9Active
PRAETORIAN SDA_5181000762026-163T93195381.48103.9Active
PRAETORIAN SDA_5191000772026-163U93595381.49103.9Active
PRAETORIAN SDA_5201000782026-163V93195381.48103.9Active
PRAETORIAN SDA_5211000792026-163W93295481.48103.9Active
SDA-NG-T1TL-4011009832026-231A93895281.5103.9Active
SDA-NG-T1TL-4021009842026-231B93895281.5103.9Active
SDA-NG-T1TL-4031009852026-231C93895281.5103.9Active
SDA-NG-T1TL-4041009862026-231D93895181.5103.9Active
SDA-NG-T1TL-4051009872026-231E93895181.5103.9Active
SDA-NG-T1TL-4061009882026-231F93895181.5103.9Active
SDA-NG-T1TL-4071009892026-231G93895181.5103.9Active
SDA-NG-T1TL-4081009902026-231H93895181.5103.9Active
SDA-NG-T1TL-4091009912026-231J93895081.5103.9Active
SDA-NG-T1TL-4101009922026-231K93895081.5103.9Active
SDA-NG-T1TL-4111009932026-231L93895081.5103.9Active
SDA-NG-T1TL-4121009942026-231M93794981.5103.9Active
SDA-NG-T1TL-4131009952026-231N93794981.5103.9Active
SDA-NG-T1TL-4141009962026-231P93694981.5103.9Active
SDA-NG-T1TL-4151009972026-231Q93694981.5103.9Active
SDA-NG-T1TL-4161009982026-231R93694881.5103.9Active
SDA-NG-T1TL-4171009992026-231S93694881.5103.9Active
SDA-NG-T1TL-4181010002026-231T93594881.5103.9Active
SDA-NG-T1TL-4191010012026-231U93594881.5103.9Active
SDA-NG-T1TL-4201010022026-231V93594881.5103.9Active
SDA-NG-T1TL-4211010032026-231W93594881.5103.9Active

Mean elements at epoch 2026-11-08 or later. Perigee and apogee are computed from mean motion and eccentricity and are approximate. Status follows the CelesTrak active list.

Summary

Space Development Agency constellation of small LEO satellites for data transport (Link 16-capable) and missile tracking.

Draft entry. Values come from the cited public sources and are awaiting editor verification.
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Operators
United States
Sources
  1. Proliferated Warfighter Space Architecture (weapons and platforms entry), Air & Space Forces Magazine
    Tier 3 · checked 2026-11-08
  2. NORAD GP element sets (current data), CelesTrak (data from the U.S. Space Force 18th/19th Space Defense Squadron catalog)
    Published/updated 2026-11-08 · Tier 1 · checked 2026-11-08
Change log
  • 2026-11-08 Entry created from cited open sources
  • 2026-11-08 Orbital elements from CelesTrak GP data (epoch about 2026-11-08): 63 catalogued, 63 active.