If by brandish, you mean in a threatening manner? On many occasions. If the FD gets called to emergency scenes with the police, there's no telling what you may encounter.
Directly at myself? Only once while I was walking my retired police dog named Snuffy outside next to my condo. For some reason, the psycho male downstairs neighbor decided to come outside and point a pistol at me at around 9:00pm at night, in a well lighted public area between his fenced in patio and the pool. As soon as he recognized me, he quickly shoved his gun in his waist band. I informed him it was a good thing my German Shepard Snuffy had her back to him taking a dump, otherwise she would have most likely seen him as a threat and taken his hand off around the wrist. He laughed uncomfortably like he thought I was making it all up and apologized. The next thing you know, she had run back over to me, then saw the gun in his waistband, and went over to him and sat down on her back feet in front of him and stared him in the eye waiting for him to make a move. There was a distinct look of fear in his eyes as he stood there motionless until I told her to follow me back inside. After that incident, he never came back out to harass us when I took her outside.