Which way does an army beret flash go?

So I have joined the cadet force and am getting my uniform ready. I need to sew on my flash to my beret but don't know which way to sew it on. It is a striped one with three stripes (order: Blue, Yellow, Blue). Should I stitch it on vertically so the stripes are 'going up' the beret or should I sew it on horizontally so that teh stripes are going side ways across the beret? Thanks!