Did Frank Greening attend the US Army's engineer officer candidate school at Fort Belvoir?
Note: See Update below for recent developments.
The engineer OCS class in 1968 included someone with the same name who looks like Greening compared to the only other photo I've seen. These are young men who had recently graduated from college and then went through a few months of
military training, posing for a photo in December. Greening had just graduated from Kings College in London that same year.

The six year period from Greening's college graduation in 1968 to his PhD in 1974 are not covered by his curriculum vitae (which I have). At McMaster someone with a BS in Chemistry is expected to finish the PhD in Chemistry in less than 5 years, and 6 years is the maximum allowable.
http://www.tapcanada.org/en/about/

Fort Belvoir has a history as a center for intelligence, having been "spook central" due to the Information Dominance Center there (LIWA), and INSCOM. Frank Greening graduated from the Signals Intelligence unit, apparently.
Other 9-11 connections to Fort Belvoir include Able Danger, Gene Corley (1961-64), and Ali Mohamed.
http://www.abledangerblog.com/2006/12/peter-lance-interview-with-1115.html
http://www.fas.org/irp/congress/2002_cr/h052102.html

Update:
This question first arose due to the discovery of the December 1968 Fort Belvoir OCS class (1-69), and the related Frank Greening, in June 2009. The question was circulated briefly among 9/11 Truth investigators at that time. The web page from which this information was obtained (www.veteransite.com/OCS.htm) was very simple at that time, with only one photo and limited text including the names of the graduates. That web page, which the internet archive showed had been posted since August 2006, was taken down within days of my June 2009 email communications on the subject, and did not appear again.
In May 2010 I posted a blog article that referenced this question and, a few days later, I noticed that a new page for this Fort Belvoir OCS class had suddenly appeared. It is now at www.leayhold-heave.com and includes the original photo and limited text, plus many more photos of class reunions from 2006 and 2009.
The new domain (layhold-leave.com) was first registered in September 2009, and last updated on November 12, 2009. But the internet archive shows that the page was never published in 2009. Apparently the domain was purchased and the page was built in 2009, but for some reason the author waited until some time in 2010 to publish it. Whether this new page was published before or after the May 2010 article is not certain.
In any case, someone other than the Frank Greening of 9/11 interest is shown in the new reunion photos, which had not been available before. This suggests that there are two people with the same name (Frank Greening), who look very similar, and who graduated from college with a science or engineering degree at the same time (in the spring 1968). These coincidences are highlighted by the fact that Fort Belvoir has numerous connections to 9/11, and the Frank Greening of 9/11 interest has worked to support the false official explanations for 9/11, as have Fort Belvoir alumni Gene Corley and John Fisher.
However, the author of this page wishes to apologize to any other Frank Greening for confusing him with the Frank Greening of 9/11 interest, if that is the case.
Here is a comparison photo with the new Frank Greening, on the left side of the back row, peeking out from behind and smiling. The 2006 reunion picture (not published as of 2009) was said to have all the graduates standing in the "same order as the graduation picture above leaving spaces for those not attending", with the additional remark: "We all look the same!". Apparently this is yet another coincidence, that the photo with which I had done some comparison work was the subject of a similar comparison by the author of this new page.

And here is the far right side of the back row. Who is the dark balding fellow, appearing shorter than his counterpart in 1968? Maybe they're not in the exact same positions (?).
