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Replacement Vulcan test launch with inert payload, experiments, and demonstrations for certification with the USSF after delays caused by payload testing of the Sierra Space Dreamchaser CRS SNC-1 mission, the original planned payload. One of the GEM-63XL SRBs was observed to blown out its booster nozzle at T+37 seconds, causing reduced and asymmetric thrust during ascent, however the performance shortfall was fully compensated by Vulcan's other stages.
Limiting rule: No flight through cumulus cloud with top at or above the freezing level.
max cloud-top 4590 m above freezing 4632 m (39% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus · METAR reports DISTANT lightning (beyond 10 SM, outside the LCC radius): "KCOF 270855Z AUTO 00000KT 10SM -DZ FEW034 OVC160 26/24 A2996 RMK AO2 LTG DSNT SW"