I don't have any insight to the executive management side of Sabre, but I've known a handful of folks that worked at Sabre in mid-level managerial roles for teams of Ugandans doing static security in Iraq.
The Ugandans they hired had a reputation of being both exceedingly polite and professional. They did a crap job, at crap wages, but managed to do it with a smile and minimal drama. Other than breaking everything mechanical; from radios to rifles to trucks to the venerable Hilux, those guys could break an anvil if they had one.
During the post-surge drawdown, static security was a good way to stay employed as a contractor, and quite a bit safer than some of the convoy security jobs. Most of the static security jobs also had the luxury of DoD response forces and QRF being nearby. There were infrequently used on remote COPs and FOBs - a more common use was in/on large bases at guard towers, interior checkpoints, clearing barrels, DFACs, etc.. These jobs were also a useful path for your average 'combat arms' type to get a year or two of experience and build a resume before applying for a WPPS contract type position.
Yes, a lot of guys left careers in the DoD early for contract jobs, and quiet a few were left standing without a seat when the music stopped.