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We Are John & Tina Koeshall

We formed Subvento, Inc as a vehicle to allow us to serve people. 


Subvento, Inc is a USA based 501c3 (non-profit organization) which serves people.  We bring assistance and support to help diverse people groups in the USA and around the world.

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Who are we?

subventō : bring aid;   
                            come quickly to assistance

Subvento, Inc is a USA based 501c3 (non-profit organization) which serves people.  We bring assistance and support to help diverse people groups in the USA and around the world. 

We accomplish this primarily through strategically partnering with people who are already heroes on the ground.  We do not seek to reinvent wheels or take credit for work being done.  We look to come alongside to prop up and amplify proven, effective efforts.  In other words, we seek to add fuel to fires already burning.

While we primarily work with the programs listed above, we also help in other areas as possible. 

We are often asked to return to continue working long-term with the teams we support.  While we try to return as we can, because of the need for the training worldwide, we cannot commit to staying long-term.  In these cases we work to train, certify and support workers to continue with the programs after we've gone.  In this way, we are able to provide meaningful tools in support of ongoing work in the areas we visit.

The training and resources that we provide are made possible through generous, tax deductible donations from people like you.  

We work with projects in the Americas, Europe, Africa and Asia.  Over the past few years, we've been privileged to work with groups in Canada, Denmark, England, Germany, Hungary, India, Indonesia, Peru, Scotland, Sweden, Tanzania, Thailand, Ukraine, Uganda, and the US. 

We currently have a waiting list of over 20 countries waiting for us to come help them.

Would you consider making a tax deductible financial donation to help us meet these needs?


john & Tina's Work in the usa and World Missions

John and Tina have a passion for helping hurting people through relationships.

We are able to develop these relationships through providing uniquely valuable training.  Some of what we do includes:

1. Teaching self-protection skills (Street Smart Defender) to those who are at risk of being exploited and individuals who have never been taught how to protect themselves.  We have seen (regardless of culture) how people are concerned with the safety of themselves and their loved ones.
We work to partner with organizations who use these classes as a community outreach.

2. Working  with organizations to teach self-protection skills and Brazilian jiu-jitsu to at risk children and youth.  We also train and sponsor workers who use our programs to work with these groups.

3.  Training leaders to successfully navigate difficult situations in a consistent manner.  Leadership training which is not only based in theory, but also gives specific steps to follow to ensure positive outcomes.  Successful communication during and after conflict builds group trust, team
effectiveness and unity. 

4.  Use ongoing martial arts training as a means to develop long-term relationships. These relationships provide a consistent platform for friendships to develop in a meaningful and personal way. These relationships also naturally bring about discipleship.

Avenues For Relationship Building

Leadership Training

empowerment &

Martial arts instruction


John developed a program called Street Smart Defender. The class not only teaches a person how to get away from an unwanted attack, but it also boosts the confidence and empowers the individual. We have taught this class on 5 continents to thousands of participants over the last few years.

We also train instructors to use the class as an outreach project into hard to reach areas of the world.

The class is being taught to families, church groups, humanitarian organizations, victims of abuse, and employees in corporate settings.

To find out more please contact us.

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Have you ever wondered why it's easy to work through issues with some people, and with others…not so much?  Do you wish you could ensure positive outcomes?  Now with E-Armor you can! 

We have just released training dealing with the resolution of verbal conflict/confrontation from a Christian leadership perspective.  This training is unique in that it not only uses solid leadership and biblical principles, but it also weaves in elements of the security and combatives world to provide a richer perspective on conflict resolution.  This class is not only theory, it is a practical “roadmap” to deal with confrontation.

Available either online or in person. To find out more please contact us.

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John has had the privilege of training and teaching martial arts around the world for over 38 years.

John and Tina use this platform as another way to reach into and minister in areas not normally reached by conventional ministers. 

While teaching martial arts, John is able to develop long term relationships with people. This allows for lifestyle evangelism and regular interaction on an ongoing basis with students.

John and Tina’s passion for sharing Christ with a lost and dying world drives this and all of the other training modalities.

To find out more please contact us.

Take a quick look at some of our work


Introducing Brazilian Jiu Jitsu training to Ugandan governmental  leaders.


Started and support 1st BJJ school in Uganda as a community outreach and development program.


Empowering at risk hilltribe youth in Northern Thailand.


Working with youth from five different hilltribe groups in Northern Thailand.


Certified Ukrainian leaders in the Street Smart Defender class for self-protection and empowerment in Lutsk &  Kyiv.


Community outreach empowerment and self-protection training in Kyiv, Ukraine.

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Self-protection and empowerment with Indian nationals.


Teaching self-protection and empowerment to at risk youth in Lima, Peru.


Building unification efforts among Ugandan  leaders. 


Leadership and conflict resolution training for  leaders.


Celebrating championship wins with close friends!


Celebrating as the East African BJJ team champions 2020!

get involved with what we do!

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Subvento, Inc.
PO Box 36
Rock Spring, GA 30739
Memo line: Koeshalls

Contact John & TIna:  

Subvento, Inc.

PO Box 2431
Lindale, Tx 75771

+1 (903) 707-6646


© Subvento, Inc  2015+  |  All Rights Reserved