Is an object still disposed if I return within a using statement?

Question

Dupe of http://stackoverflow.com/questions/662773/returning-in-the-middle-of-a-using-block

Question title is fairly obvious I think, so given the following code is the SecurityDisabler disposed if true is returned?

public bool CreateProxyItem(string name, Sitecore.Data.ID sourceID, Sitecore.Data.ID targetID)
{
    // create an instance of the master database
    Sitecore.Data.Database master = Sitecore.Configuration.Factory.GetDatabase("master");

    // get the proxy item template
    Sitecore.Data.Items.TemplateItem proxyTemplate = master.Templates[Sitecore.TemplateIDs.Proxy];

    using (new Sitecore.SecurityModel.SecurityDisabler())
    {
        // get a reference to the proxy container item
        Item proxyContainer = master.Items["/sitecore/system/proxies/"];

        if (proxyTemplate != null && proxyContainer != null)
        {
            Item proxyItem = proxyContainer.Add(name, proxyTemplate);

            if (proxyItem != null)
            {
                proxyItem.Editing.BeginEdit();
                // editing here
                proxyItem.Editing.EndEdit();

                return true;
            }
        }
    }

    return false;
}