If I remember correctly when entering the designated war zone of Vietnam the war bonus was paid on your basic pay at 100% but not on overtime pay. I have received 100% of my total pay when sailing to Kuwait and Saudi Arabia on several occasions with two different companies during the Iran/Iraq war in the mid 80's .I received nothing for working in Southern Sudan in 82/83 when the Southern Peoples Liberation army were fighting a civil war with the North of the country. I received 200% of my salary while working in the Yemen during the first Gulf conflict in the early 90's this was because Saudi Arabia had had kicked out all Yemeni nationals from the kingdom as they and their government were firmly on the side of Iraq and against the western coalition and The Saudi's were expecting an attack in the south of the country by the Yemeni army .Most of the Western Embassies had closed and repatriated their employees including the British Embassy due to the strong possibility of civil disturbances and the animosity of the local population . I had heard that there were only about 150 expats left in the country. We had a meeting with a very senior Presidential officer who had promised us that not one hair would be harmed on any expats head if we stayed and if need be they would assign two members of the presidential guard to each individual expat. The Yemeni government considered it vital to keep the oil production going (About !60000 barrels a day) As the production facilities at Ma'rib were surrounded by a very heavy military defence force and the two expat camps in Sana'a were well guarded and any travel that I had to do was by helicopter I stayed and considered it money for old rope.