Bronco Drilling Company, Inc., (Nasdaq/GM:BRNC), announced today operational results for the month ended and as of October 31, 2008. Utilization for the Company's drilling fleet was 87% for the month of October compared to 84% for the previous month and 84% for the third quarter.

Bronco Drilling Company, Inc. (Nasdaq/GM:BRNC): What: Bronco Drilling's Third Quarter Earnings Call When: Monday, November 3, 2008 at 11:00 a.m. ET How: Dial-in # 866-700-7477; International Dial-in # 617-213-8840; Participant Code 34960491.

Bronco Drilling Company, Inc. (NASDAQ/GM:BRNC) announced today the date of its Annual Stockholders' Meeting, which is set for November 17, 2008. The Company's annual meeting will be held at 10:00 a.m.

Bronco Drilling Company, Inc. (NASDAQ:BRNC): What: Bronco Drilling Operations Update Call When: Monday, August 18, 2008 at 11:00 a.m. ET How: Dial-in # 800.706.7748; International Dial-in # 617.614.3473; Participant Code 98868868.

Allis-Chalmers Energy Inc. (NYSE:ALY) and Bronco Drilling Company, Inc. (NASDAQ/GM:BRNC) announced today that they have terminated their Agreement and Plan of Merger relating to the proposed acquisition of Bronco by Allis-Chalmers.