Check with Tim W. (Corven) or T.J. P. (Tydirum) for the DSG back patch. They ordered extras during the last run.
Here’s a link to the Legion forums for the current name tag, https://www.501st.com/forum/viewtopic.php?f=53&t=91545.
As for the smaller patches (3.5 inch), we’ll be doing a run for the DSG patches very soon but I have home that I can’t give you the next time I see you. You can also check the FISD Detachment forums for patch runs. Most of us get other patches through trades or events that we’ve trooped over time.