There are a variety of things that can cause this. Here are two to check:
Look for typos in the first node. For example, typing true branch=2 instead of true_branch=2 (leaving out the underscore).
Also make sure the first node, [node.0], has the line filler=0 so that you can start the campaign and that the percent_true equals 100. If it is less than 100 and it comes up false your pilot will show as “retired” as soon as he is selected