What is the best and most efficient way to get into Jump School as an Officer in the Army Guard/Reserve (non-infantry)?

Look for a Reserve component Unit that has jump slots... or has a potential Airborne mission...
Looks at Infantry... SF... Support or Combat Support Units... apply to go to Ranger school...
Question ???
WTF do you want to go to Jump school...
The abuse to your Body is exponentially amplified... Prime example... 2 Replaced Knees and 1 ankle... and the other that sounds Like i'm walking on a bag of Potato Chips...

CPT(P) (Join to see), there are airborne units in the ARNG and the USAR. If you wish to go to jump school, try to transfer to an airborne unit. I watched a USAR unit conduct an airborne training operation at Fort Campbell a few weekends ago.
In the photo the USAR paratrooper is preparing to land on Corregidor Drop Zone, Fort Campbell, Kentucky, 21JAN17. The C-130 in the background is getting ready to make another pass. CPT Gabe Snell

I have been retired for 17 years now, but at one point I was the Military Education Manager at a NG Division Headquarters. We received a budget each year from our State Hqs, which was never enough to fund the required schools, let alone nice to have courses like Airborne. I used to receive applications from young lieutenants and captains requesting Airborne school. These individuals were not in Airborne slots. I always turned them down. It wasn't that I wanted to, but I also had applications for MOSQ schools, Officer Basic and Advanced courses, and PLDC among other required schools that I had to find funding for. And if you wanted to go to NCO Advanced or the Sergeants Major Academy, you did it through Correspondence Courses, Reserve Component Courses or the USASMA Resident/Non Resident course. (That is how I and my peers went through the Sergeants Major Academy - no double standard because of where you were assigned)

Unfortunately, the Reserve Components have always had to accomplish the mission without enough funding. That's just the way we had to live. Heck, we only got 39 bullets each for our Annual weapons qualification with our M16 Rifles.