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Normal RI concurrance sequence: 

sign-off at FRR
sign-off at L-1 (go: integration, orbiter, engines)
after L-1, all "GO's" are verbal
(Rocco was surprised MSFC asked for written GO from MTI)
RI has someone (usually Rocco, in 51L case, VP's) in firing room. Engineers in Downey who usually make their inputs through MER. 
ICE question didn't go through MER, ∴ no chit or documentation, just verbal. 

Look at SRB ignition films - ICE is dramatic (A2 says the team working group verifies this). 

Other considerations (previous launches) [[arrow to right]]