Don't even think about it

Changing of the guard between the Granma Memorial and the Museo de la Revolución.

   The reverence in which Cuba's leaders hold the artifacts of their long-ago struggle – the cars, the planes, the boat that carried Fidel Castro and his followers from Mexico to Cuba – is evident in the number of soldiers at the Granma Memorial.
   They stand on the catwalk beside the glass case that encloses the yacht; they walk quietly among the displays below. They change the guard in red-bereted unison on Calle Colon, now a fenced square between the memorial's eternal flame and the Museo de la Revolución, but 55 years ago a Havana thoroughfare-turned-battle zone.
   You cannot touch the Granma yacht. You could, I suppose, touch the other items, but it doesn't seem advisable.
   The soldiers look away from visitors. They are not there to engage in conversation. But I manage to catch the eye of one young guard and mime spinning the two-bladed propeller of a Kingfisher observation plane seized by the rebel army in 1958.
   He gives me a tight, yeah-yeah-I-get-it smile. I guess he'd seen that one before.

Prop-plane probably wouldn't have started anyway.

The guards avoid eye contact. They are not guides.

Touching the vehicles is not recommended, but touching fellow visitors would appear to be OK.