"'Be Best!' Not 'Be the Best,' or 'Be Your Best,' or 'Be the Best You Can Be.' Not 'Be Better' or 'Be Safe,' or even 'Don’t Be a Jerk' (which is an actual campaign launched in New York to promote safe cycling)."

"'Be Best' just so plainly doesn’t hold up to the laws of English grammar, which require that a superlative adjective following an imperative verb be preceded by the definite article 'the.' Be good – be better – be the best: that’s the rule. In the 1990s, the British military ran a TV ad campaign that ended with the slogan: 'Army soldier: be the best.' Try it without the the. 'Army soldier: be best.' It sounds like you’re translating from the Sanskrit. How was the unfortunate name conceived? Could it have been [Melania] Trump, surrounded by administration flunkies, in a brainstorming session in Washington, floating 'Be Best' as a potential campaign name – and the assembled coterie being too polite – afraid, even – to correct her? Or was it some inside joke about [Melania] Trump’s English? (The first lady’s native Slovenian, like most Slavic tongues, Bulgarian and Macedonian excepting, has no definite articles.)"

From "'Be Best': does Melania Trump's oddly named initiative break the laws of grammar?/A Guardian copy editor unpacks the central grammatical flaw in the first lady’s new campaign. Is this [the] best the White House can do?" (The Guardian).