Is the same as "need"? What meaning does "duly" add to "require"?

EDIT: Adding example I found online from the 1957 'Penal Code of the Empire of Ethiopia':

A commanding officer who: (a) in battle or in the face of the enemy lays down his arms, despatch a bearer with a flag of truce, hauls down his flag, or surrenders with his men without having done everything that the exigencies of military duly require of him; or...

http://www.unhcr.org/cgi-bin/texis/vtx/refworld/rwmain?docid=3e4a40244

Is it the same as "need"? What meaning does "duly" add to "require"?

EDIT: Adding example I found online from the 1957 Penal Code of the Empire of Ethiopia:

Art. 326. Capitulation.

A commanding officer who:

(a) in battle or in the face of the enemy lays down his arms, despatch a bearer with a flag of truce, hauls down his flag, or surrenders with his men without having done everything that the exigencies of military duly require of him; or [...]

Is the same as "need"? What meaning does "duly" add to "require"?

Is the same as "need"? What meaning does "duly" add to "require"?

EDIT: Adding example I found online from the 1957 'Penal Code of the Empire of Ethiopia':

A commanding officer who: (a) in battle or in the face of the enemy lays down his arms, despatch a bearer with a flag of truce, hauls down his flag, or surrenders with his men without having done everything that the exigencies of military duly require of him; or...

http://www.unhcr.org/cgi-bin/texis/vtx/refworld/rwmain?docid=3e4a40244