Prefetching token via RequestSecurityToken block w/ UsernameToken

Hey guys,

I'm trying to use SoapUI to make some requests to a provider. From what I can work out, there needs to be a token fetched via a RequestSecurityToken xml body (which includes a UsernameToken embedded in the header). Subsequent requests embed this token in their headers. Along with some signing / encryption .. but those parts probably aren't as troubling.

I've attached the policy section of the .wsdl -- hopefully it makes more sense to someone here how to enact this in SoapUI than it does it me!