For a stay longer than 180 days, the flat-rate per diem is 55 percent. Rates are fixed, and partly based on the cost of living in a location. Johnson said the changes are meant to give long-term TDY travelers an incentive to seek out extended-stay lodgings, which generally are less expensive.
Bilirubin is a yellow pigment that causes jaundice and dark yellow colored urine when present in increased amounts. Some people normally have higher bilirubin in their blood. This is known as Gilbert's disease. So their urine will naturally have more bilirubin.
The commonly used antibiotics nitrofurantoin and metronidazole can lead to brown urine discoloration. Chloroquine and primaquine have also been implicated. Certain laxatives, as noted elsewhere, can also be causative. Additionally, the consumption of fava beans and aloe has been believed to cause urine to turn brown.