A neologism by myself.

In his lifetime a man takes part as a member of many teams in sports or business; causual or serious; fleeting or enduring. Sometimes the boundaries between these teams, and the identifications of members, is not so clear. Each instance of such experience brings greater understanding of one's capabilities and potential, both as a team member and as an individual. I give to the idea of the practice of taking part in teams, as I describe foregoing, the term "teamsmanship." I think it is a new one and I find it very helpful in keeping from getting too comfortable about being a member of any one or another single team, while providing a central idea to gather all my thoughts about my ongoing development of team skills in various settings and various team memberships. It serves as somewhat of a counterpoint to the term and idea "sportsmanship," where everything is for the moment and winning or losing is today's only marker. A nation needs men to last beyond defeat, and to take victory deeper into the population.