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The hosted TWINS-1 payload was launched aboard the NROL-22 (NRO Launch-22) mission, also referred to as USA-184, on June 28, 2006. The launcher was a Delta-4-M (4+2) vehicle and the site was VAFB, CA, USA.

The TWINS-2 payload followed aboard NROL-28 mission, also referred to as USA-200, on March 13, 2008. The launcher on flight was was an Atlas-5-411 vehicle and the site was VAFB, CA, USA.

Prior to launch, the TWINS-1 and -2 payloads were referred to as TWINS-A and TWINS-B, respectively. — The host spacecraft USA-184 and USA-200 are being operated by NRO.

“the pair can provide nearly continuous magnetospheric observations in addition to simultaneous, dual platform viewing for a portion of each orbit.”

Source: https://www.eoportal.org/satellite-missions/twins#spacecraft

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