The following text comes from an American Army guidebook that was distributed during the second World War to soldiers stationed in Iraq.
(Emphasis added to some lines.)
SOME IMPORTANT DO’S AND DON’TS
Keep away from mosques.
Smoke or spit somewhere else””never in front of a mosque.
If you come near a mosque, keep moving (away) and don’t loiter.
Keep silent when the Moslems are praying (which they do five times a day) and don’t stare.
Discuss something else””NEVER religion or politics or women””with Moslems.
Remember the fear of the “evil eye.” Don’t stare at anyone. Don’t point your camera in anyone’s face.
Avoid offering opinions on internal politics.
Shake hands with the Iraqi; otherwise don’t touch them or slap them on the back.
Remember that the Iraqi are a very modest people and avoid any exposure of the body in their presence.
Keep out of the sun whenever you can. When you can’t, keep your head and neck covered.
Start eating only after your host has begun.