On a recent Friday afternoon, under the watchful gaze of local food bank staff, 68-year-old John Samuel pawed through a box of government-sourced canned goods and found little inside that he wanted.Canned carrots? “I wish we had peas,” he said.Grape juice? “Well - it’s okay.”Powdered milk? “Horrible.” He tossed the bag on a growing pile of identical bags, each abandoned by a food-box recipient earlier that day.Such are the trade-offs of the Commodity Supplemental Food Program, a limited federal initiative for low-income seniors - and the model for the Trump administration’s controversial pitch to radically transform the food-stamp program.The administration last week proposed halving the monthly benefit of most participants in the Supplemental Nutrition Assistance Program, or food stamps, and replacing it with a “Harvest Box” of shelf-stable, government-sourced foods, a system that White House budget director Mick Mulvaney compared to Blue Apron.The proposal was directly modeled after the existing senior food-box program, a USDA spokesman said, and will include similar features.