Dubtronic font (free download) - https://www.fontsquirrel.com/fonts/dubtronic
This tutorial covers how to create a flag effect inside Illustrator using a mix of shapes and text. One of the key things that makes this effect look cohesive is grouping the rectangle that makes the shape of the flag and the text together. Doing so applies the effect evenly to both, leading to great looking results.
A cool bonus to this workflow is that this works awesome for all sorts of different warp effects inside Illustrator. These sorts of effects are perfect for creating other looks like banners as well!