Why there is "End Transmission" message after distant talk?

Why after finishing any distant Federation communication, there is an "End Transmission" text:

Shouldn't it be:

• Transmission's End,


• End of Transmission,


• Transmission has Ended or


• something different

"End Transmission" sound much more like a order or command ("End transmission now!"), not like an informational message.

(assuming, this question is on-topic and shouldn't be asked on ELU )