The spurs and long rifle suggest Mounted Infantry.
Its unlikely that such a heavy armor could be carried on foot for very far.
Most Calvary was relegated to Mounted Infantry tactics once automatic weapons made the Calvary charge suicidal.
Mounted Infantry rode into the general area of a battle then dismounted to fight on foot. There were exception such as the charge of the Australian Light Horsemen who were actually mounted infantry rather than calvary and carried no sabers.
Interesting armor, not sure if that one is in my book.
https://archive.org/details/helmetsbodyarmor00deanuoft