Examples:

{{Armed forces}}

{{country data {{{1}}} | Military/core | variant = | size = | name = }}

{{Armed forces/sandbox}}

Error: expandTemplate: template "Armed forces/sandbox" does not exist

{{Armed forces}}

{{country data {{{1}}} | Military/core | variant = | size = | name = }}

{{Armed forces/sandbox}}

Error: expandTemplate: template "Armed forces/sandbox" does not exist