Cargo plane being loaded with humanitarian aid for Ukraine

The video begins with a brief greeting, 'Hi. Grosley bravo.'

What do you think the phrase 'Grosley bravo' could mean?

How would you describe the tone of the greeting 'Hi. Grosley bravo.'?

In what context do you think someone might use the phrase 'Grosley bravo'?

What emotions or reactions might the phrase 'Grosley bravo' evoke in a listener?

If you were to respond to 'Hi. Grosley bravo.', what would you say?