Leadership is a huge component to your OCS board package. At OCS you'll be put in various critical thinking scenarios, so your OSO and the board is going to want to know if you can be a leader.
My OSO asked me if I had ever been a sports captain. I said no. He then asked if I had been in student government. I also said no.
Luckily, even though I spent my college years being very hedonistic and self-serving, my adult life after that I served my community as a paramedic. I worked four hard years at Philadelphia Fire Department, an experience I believe got me into OCS and allowed me to succeed there. During my time there, I had responded to over 5,000 911 calls. Most were nothing crazy, but a good 300 were critical patients, and a good 10 were life-or-death scenarios, including an infant cardiac arrest and a massive head injury sustained by a young man at a construction site. During these scenarios I successfully led my crew to stablize patients and delivering them to the ER in a better condition in which I had found them.
For your package, you'll need letters of recommendation, and I am deeply thankful to my coworkers at Philly Fire who wrote me good letters. I could not have gone to OCS without them.
If you are in college, get involved. Be active. If you are out of college, the same goes for you. Ain't no congressman telling me I was going to be a future leader when I was 17, hence why I could never have gotten into a service academy. You'll have to think outside the box on this one!