Could you explain the meaning of these words.

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May 19, 2012 19:10
I watch an American drama "NCIS" with English subtitles. It's my favorite one. I'm a fan of Gibbs!

However,I can't understand some wards.
A psychiatrist,Kate's sister said to McGee,
'You successfully transformed from probie to special agent'
And Gibbs often say when they go to a crime scene, 'Grab your gear!'

What do these words meaning "probie" and "Grab your gear"?
My dictionary does't have these wards. Please someone tell me its meaning.