This monograph examines the burden-sharing of new members in NATO. Qualitative and quantitative methods are used to test the hypothesis that new NATO members are burden-sharing at a greater rate than older NATO members. An analysis of the burden-sharing behavior of NATO’s 1999 wave of new members reveals that new NATO members have demonstrated the willingness to contribute to NATO missions, but are often constrained by their limited capabilities. However, new member contributions to NATO have improved and, in comparison to older NATO members, the new members are doing quite well. The United States should focus on improving the capabilities of the new members while encouraging its older allies to increase their own contributions to the alliance where feasible.