Generate a correct and concise answer for the question based on the words in the context.

Context : Alfred Verhulst was a Brigadier General in the United States Air Force. 
Question : Which armed forces did Alfred Verhulst serve?
United States Air Force

Context : Empress Gongrangzhang (恭讓章皇后), personal name Hu Shanxiang (胡善祥) (died 1443), married the Xuande Emperor in 1417 but was deposed in 1428, mother of Princess Shunde Empress Xiaogongzhang (孝恭章皇后), family name Sun (孫) (died September/October 1462), daughter of Sun Zouzhong (孫鄒忠), initially created an Imperial Concubine (嬪) in 1417, elevated to the rank of Noble Consort (貴妃) upon the Xuande Emperor's accession in 1425, created empress in 1428 after the deposition of Hu Shanxiang, became Empress Dowager (皇太后) upon the accession of her son, created Empress Dowager Shangsheng (上聖皇太后) in December 1449, created Empress Dowager Shengliecishou (聖烈慈壽皇太后), mother of the Zhengtong Emperor and Princess Changde Empress Dowager Xiaoyi (孝翼太后), family name Wu (吳) (died December 1461), daughter of Wu An (吳安), granddaughter of Wu Yanming (吳彥名), created Consort Xian (賢妃) in 1428, initially given the posthumous name Consort Rongsixian (榮思賢妃), posthumously honored as Empress Dowager Xiaoyi by the Chongzhen Emperor, mother of the Jingtai Emperor Imperial Concubine Guo Ai (嬪郭愛), personal name Guo Ai (郭愛), courtesy name Shanli (善理) (died 1435), was buried with the Xuande Emperor after his death 
Question : What is Xuande Emperor's spouse's name?
Empress Xiaogongzhang

Context : In cryptography, DES-X (or DESX) is a variant on the DES (Data Encryption Standard) symmetric-key block cipher intended to increase the complexity of a brute force attack using a technique called key whitening. 
Question : Which is the basis of DES-X?

Data Encryption Standard