US Space Development Agency, a standards setter for optical communications terminals, is reluctant to name its suppliers

by Peter B. de Selding

LA PLATA, Maryland — The Sept. 2 launch of 13 U.S. Space Development Agency (SDA) satellites leaves brings to 23 the number of Tranche 0 Transport and Tracking spacecraft in orbit, with four more to launch later this year. One will remain on the ground as a testbed.

All these missile detection and tracking satellites are equipped with optical communications terminals (OCTs), which SDA has repeatedly said is a key development goal for its Proliferated Warfare Space Architecture.

Tranche 0 is designed to test these . . .

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