Acquiring signal…
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Classified payload for the U.S. National Reconnaissance Office.
Limiting rule: No flight through cumulus cloud with top at or above the freezing level.
max cloud-top 2175 m above freezing 3533 m (5% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus