At the bottom of Petty Officer Blake's official bio, the last line reads "For additional information about LT Nash....". LT Nash was the antagonist in the previous episode "Breaking Brig" NCIS: New Orleans (2014)
In Petty Officer Blake's official bio, his duty station is listed as DDG-154 and his duty description is that of a standard shipboard Leading Petty Officer.
The medical examiner referred to the dead Sailor as Chief Petty Officer Blake (E7), and in the next scene his official profile lists him as a Petty Officer First Class (E6).