It's the N in NBC

This page is the CodyCross answer for the clue below from Space Exploration, Group 911, Puzzle 2 (Space Station).

Question is: It's the N in NBC

and the answer is: NATIONAL

Word Meaning:

NATIONAL — Pertaining to a nation or country, especially as a whole; affecting, shared by, or existing throughout all of a nation.

Definitions from Wiktionary.