Ummm in reference to WW2 it was the location of the 2nd Division New Zealand General Hospital.
http://www.nzetc.org/tm/scholarly/tei-WH2MMed-c10-14.html
Correct MontyB, and you are spot on the website. I only just found it. Did you spot the last paragraph. 'Ready for the rush (of injured) from El Alamein.' And they had come from what is now Israel.
I feel like Michener sticking a pin in the map of America and stabbing Centennial to write about. El Ballah is just a rail halt in the desert and it late became a British Station Hospital at the time of The Forgotten War, of the early fifties. Insurgency was at its height from the Moslem Brotherhood, the spawners of Al Quaeda, based in nearbu Ismailia andwhich still exists at the political source of the Islamic Caliphate.
The period 1951-54 key, but unrecognised after the Suez attack fiasco of 55, and campaign medals have only just been awarded.
When I served at El Ballah, it had become a battle camp, just a barbed wire perimeter around tents, very exposed in hostile territory on active service.
I was surprised to find it has a few of its own websites with photos and details of many who served there, including 'colonials'. I particularly like the photo galleries of guys, depicted then young now old, one with his son and grandson, and the latter was about to take up his stint in Iraq.
Looks like you 'colonials' travelled well. Well, here's a belated thanks from folk who needed all the help they could get.