:* The first two paragraphs are unreferenced. 
 :* The claim in the third paragraph, i.e. "International broadcasters such as the BBC World Service also use UTC ..." is unreferenced. 
 :* The claim in the fourth paragraph about Zulu time is unreferenced. 
 :* The claim in the final paragraph about the international space station is unreferenced. 
 :* Most of these paragraphs are short, very short, sometimes a single sentence, so they should be merged. 
 ::* The first paragraph is probably OK as it stands. The second paragraph is a single sentence about about global commerce: I see no reason why it can be merged with the fifth paragraph which is about global transportation. 

 * Definition and relationship to other standards - 
 :* This has much more in-line citations but also suffers from mostly single sentence paragraphs, one two-sentence paragraph and a three-sentence paragraph. The first three paragraphs could be merged into one. 
 :* There is no need to wikilink both occurrences of Universal Time is a single section, this is WP:Overlinking.