I am a civilian Mason, currently deployed to Iraq. Unhappily, there are no operating F&AM lodges, anywhere in Iraq or Afghanistan. There are only Prince Hall lodges here.
During WW2, many lodges operated "round the clock" to assist deploying soldiers in completing the ritual work, when the soldier was deploying. Many of these Masons went to war, and made the supreme sacrifice. Many returned, and went on to serve Masonry well.
I reside in Virginia (My masonic membership is in Kentucky). Virginia has One-Day classes, and has had them for several years. In the Washington DC metro area, where I live, many men have to spend several hours per day commuting, and thus attending degree work during the week is impossible. Having ODC's on Saturdays, has enabled many men to be able to participate in Freemasonry, who otherwise never could.
Several states currently permit ODC's, most have had favorable success with their programs. The current GM of Florida, has stated that there will be no ODC's during his time in office.
I prefer to keep an open mind, with respect to ODC's. In my state of residence, many of the ODC grads have gone on to serve Masonry ( and the appendant/concordant bodies) well.
If a man completes a ODC, and then wishes to view the degree work on a more traditional schedule, he is certainly free to attend degree work, later on.