The following are known Action Replay Codes for Steel Horizon on Nintendo DS (NDS).

Game ID: AS4E-13775146

Current Performance Points
021b89b0 3b9ac9ff

Maximum Performance Points
021b89b4 3b9ac9ff

Infinite Resources
02269d20 3b9ac9ff

Press SELECT for Extra Moves (1st 7 Ships)
94000130 fffb0000
021b5720 00030000
021b582c 00030000
021b5938 00030000
021b5a44 00030000
021b5b50 00030000
021b5c5c 00030000
021b5d68 00030000
d0000000 00000000