The left one is the ribbon for the Knights Cross to the Iron Cross.
The center one ( blue ) is an S.S. ribbon. ( can't find this one )
The right one is a " West Wall " ribbon. ( helping to build defenses/defend the Normandy/Atlantic coast before invasion)
In source see item number GMRB-024, it shows first ribbon
Item number GMRB-012 shows West Wall ribbon with a East Front ribbon
P.S.
Found it, and you are correct , a blue S.S. ribbon is a 4-year service ribbon, scroll down in second source.