Star Trek Discovery: Every Easter Egg & Hidden Reference From 'Far From Home'
5. Starfleet Regs
In order to prove her and Saru's Starfleet-ness, Tilly cites Starfleet regulation 256.16: "Officers shall display behavior befitting an officer at all times."
This is one of the show's more obscure references to Star Trek lit, drawn from Josepha Sherman and Susan Shwartz's 1997 novel, "Vulcan's Forge".