I encourage you to read this edition of the Inquiring Mind, especially articles by Bhikkhu Bodhi, Ann Wright, (a peace activist who spent many years in military and State Dept.) and many other thought-provoking pieces including the merits of bringing mindfulness to the military.
This talk outlines basic qualities required in meditation in accordance with: one always prefect in virtue, endowed with wisdom, well concentrated, one energetic and resolute - crosses the flood so hard to cross.
SNI53
Tara explores a range of questions that include working with unworthiness, recognizing aspiration, stepping out of the story and understanding the selfless quality of experience.