How can I get an authorized sponsor to raise money for the BOSS program?

AR 600-29: Fundraising within the Department of the Army

https://armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/r600_29.pdf

https://dodsoco.ogc.osd.mil/Portals/102/Documents/Deskbook%20Chapters/2020_Fundraising_DB.pdf?ver=2020-06-18-150116-923

I would be very cautious with this. I have raised funds for an unofficial unit fund. Must units usually have a "Battalion Activity Fund." You can raise money internally. The boss program is usually at a higher level and is already funded. You can't have a private company sponsor a unit. I have see this go badly when there was an investigation. Are you trying to plan an event for a unit level BOSS event?

If I remember correctly from my time in SAMC as a treasurer, you can solicit any outside agency to support your program. However, if you are going to solicit Soldiers for money, or solicit on post, you'll need a legal review.

If you're going to solicit sponsors they will expect some type of advertising in return. A good example is BOSS sets up a 5K run, possibly a fundraiser, you solicit sponsors, the entry fee for the run includes a Tee shirt with the logos of all your sponsors on it. The sponsors get cred and a taxable deduction, your organization gets money and recognition. It's a win win for everyone.