Andrew,
Captain Robert W. Mitchell, Company E Note crossed lances on kepi.jpg
Captain Robert W. Mitchell,Company E,
Note crossed lances on front of kepi.
It appears this might be early on and from other photos it appears that the normal cavalry sabres were worn on top with a number 6 above, as the lances look fragile.
A good site to view,
www.rushslancers.com
Hope this helps,
Clay