OK - here's personal experience through those years.
I was enlisted 1968-1972, and spent most of that time at A&M pursuing additional degree programs - Active duty students on campus wore uniforms one day a week to complement the Corps of Cadets. Spent calendar year 1970 in Iceland. Travel in uniform was not a problem for me. In fact, since assignment was remote, beards were OK Achieved rank of TSgt.
As the Viet Namese War strung out it became extremely unpopular by the general population and consensus. My personal opinion of the reason why is because the U.S. military was filled with mostly draft eligible troops who were limited in action by the approvals required in Washington and political pressures to not use the available military might that "might aggravate China" into entering the War. Therefore, the troops (most of whom were not volunteers) were hamstrung from "winning" - which should be the end goal in any war. It strung out so long. Very frustrating for both the troops and the civilian population at home who wanted more action and a conclusion. There was a lot of "dead time" in which many of the troops experimented with drugs for the first time and came home addicted. The issue of PTSD (Post Traumatric Sydrome) became a front and center issue and "mental health" became a primary concern of healthcare professionals more than ever before - and has become a primary issue for the military ever since.. The press was involved on TV for the first time and did their very best to show every possible negative situation that occurred - intended or not. Notable celebrities like Cassius Clay/Mohammed Ali refused to go in spite of being drafted - set a pattern of non-aggressive resistance that became a resistance nation wide. Very NON-patriotic.
The "enlightened age" of the late 1960's with commune living all along the West Coast and anti-establishment activities like Woodstock in 1969 - all promoted by the media - all contributed to the mood of the time. "Free Love" with the advent of "the pill" did not jive with the conformity required in the military and the general population up until that time. The point is that the boomer kids raised on Dr. Spock non-corporal idealism was diametrically opposite the mind set required by the military. FWIW, the A&M Corp of Cadets had a lot of pressure to "weaken it's traditional" activities after becoming optional in 1965 as well. I never observed the co-eds causing that much of a rukus as was expected. But, the Corps becoming non-required was mind boggling change for A&M - especially given what was going on at most other college campuses with SDS (Students for a Democratic Society) etc.
I was Commissioned as an officer in 1972, Stationed in downtown Dallas 1973-1978 in Federal Building at SW Division Corps of Engineers. During this period All of us active Military were told to wear civilian clothes to and from home to office downtown and only wear uniforms when on base. This was due to various attacks on military personnel in Dallas. We were not allowed to even stop and shop en route to base (Carswell) or downtown Dallas in uniform, nor were we allowed to travel in uniform at the time. We changed into uniform after arriving on base when TDY or enroute PCS.
This changed during the period when I was at USAFE 1978-1981. Afterwards, when I was at HQ USAF in both San Antonio and Washington D.C. during the 80's there were not restrictions on wear of the uniform depending on job requirements. The uniform was not a detriment during those years at all and in fact there was a lot of pride in the wearing of the uniform.
When the Middle East flared up and the troops who participated were "volunteer" the mood of the country switched from antagonistic toward the military to being supportive of the various altercations. When Kuwait was invaded and Iraq/Saddam was swiftly deposed which was a feather in the cap of the military in spite not finding weapons of destruction (which had been moved into Syria). .
Vast improvement in weaponry (GPS, drones, etc.) whereby targets were hit within a few feet accuracy with minimal damage to the civilian population was much more palatable than the sweeping damage often done in Viet Nam.
AAAAAAAAAAg - Air Force Aggie Architect and Hospital Administrator fm Amarillo, Altus, Austin, Arabia, Arkansas, Africa, Seoul, Bahrain, Amman, Kuwait, Iraq, Iran, Saudi, DFW-Fairview, Ramstein, San Antonio, Pentagon, OKC, JCAHO/JCR - '65, '69, '73 - A&M Letterman (ret).
Winston Churchill: “If you’re not a socialist in your twenties, you have no heart. But if you’re not a capitalist in your thirties, you have no mind.”