The flag in this challenge is coded in the NATO phonetic alphabet, which we can discover by googling the title "Alpha Bravo Charlie"
Using this image, from the [NATO phonetic alphabet wikipedia page](https://www.wikiwand.com/en/NATO_phonetic_alphabet), we can decode the flag: ![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/FAA_Phonetic_and_Morse_Chart2.svg/700px-FAA_Phonetic_and_Morse_Chart2.svg.png)
The flag is: SAH{R4DI0TALK}