Hi @bruce thank you for posting in the community! While this shape is not available in our shape libraries you can create a Custom Shape out of a flex polygon. 

I find it the easiest to create the chevron shape by setting the sides of the polygon shape to '6'. After that you can adjust the edges to create the desired shape. 

Once you get the shape you need you can right click and save that shape to a Custom Library. You can also import an image and save it as a shape if there is an image of the chevron shape you'd like to use in your diagram.

I hope this helps! Feel free to let me know if you have any questions.