Does the Burns & McCallister policy of excluding woman from
negotiating contracts in certain third world countries violate federal
employment discrimination laws?  Can a company be committed to
employment diversity if it turns its commitment on and off depending
on the dollar value of contracts it is negotiating?  Ethically
speaking, under what circumstances can a company be asked to sacrifice
revenues?

Note to Researchers: Burns & McCallister is not a real company but a
fictional one, mentioned in business ethics (and business English)
text-books, for the students to extercise either writing in legal and
technical English, or that they'll analyse topics such as business
ethics, discrimination, etc.

See for example: 
Thomas L. Wheelen, J. David Hunger, & David Wicks. 2004.  Concepts in
strategic management and business policy, 9th edition, Prentice-Hall
Ch. 9 .

Generally USA federal law, does not apply to persons employed by the
company in foreign countries. Where it does, in my oppinion, the USA
is being unreasonable.
 Commitments to employment diversity typically are PR retoric designed
to get customers, keep lawyers and bureaucrats away, but have little
ethics envolved beyond what is forced on the company. Exceptions do
occur.   Neil