I mentioned 'generally' as there are concrete cross-cultural differences and socio-economic factors involved in sexually dimorphic leg-to-body ratios (LBR).
I'm not familiar with the book you mentioned nor the US military anthropometric data source. I'd suggest that the US military data is not representative of the male/female population. For instance, women represent about 13.4 percent of the active Army, 23.7 percent of the Army Reserve and 14.0 percent of the Army National Guard (2009). We know that women are aprrox 50% of world population.
I'm unsure if the data is from 1977 or more recently 1996 (based on a 1988 dataset). If we use the 1988 dataset of males (n=5103) and females (n=3446) women of heights 72-78" are not accepted whereas males are. This invalidates the dataset.
Another example...the US military are trying to fit people into their military hardware cockpits, uniforms, body armour etc. and would select according to these specific criteria. Their sample is not representative. MC ANSUR recognises this when they state "There are no statistically valid anthropometric data representative of the current USMC population for design and sizing of ICE. " (http://nsrdec.natick.army.mil/MC-ANSUR/index.htm
And just to muddy things further there isn't a standardised measurement in use. For instance, in a 1995 document, (p. 26 http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA316646&Location=U2&doc=GetTRDoc.pdf
) height could Acrimonial Height (floor to shoulder) or Cervicale Height (floor to cervicale). Leg length is variously measured as Crotch Height, Buttock Height, and Functional Leg Length. I've no idea of which measurements the authour of your book mentioned and the statistical method he used to analyse the data as no LBR is provided in doc I linked.
Height is also measured differently in different disciplines (ie. some include foot length and others exclude the neck/head).
Interestingly, there are numerous studies that show females with a higher LBR (in western cultures) are seen as more attractive, that might explain my bias! But the semi-nomadic Himba people of Namibia see women with low LBR, and men with higher LBR, as attractive.
So er, to the OP, measure your wife, the other data is inconclusive