A host of wild theories have sprung up as explanations about why the military is carrying out training exercises in five southern states including Texas.

To hear the conspiracy theorists tell it, a labyrinth of tunnels is being built under Walmart stores for military attacks on civilians, and an orchestrated financial crisis will lead to martial law, U.S. troops patrolling chaotic streets, and a dictatorship under President Barack Obama.

These and similar tales have gained currency in recent months among a small but powerful group of anti-government Texas voters in the run-up to planned military training drills in the West and Southwest, including in the Lone Star state.

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Meeting: At an April town hall meeting in Bastrop, attendees peppered a military spokesman with pointed questions, including: 'Are you planning on detaining or rounding up any American citizens?'

Locations: The military said Army Special Operations Forces will train in Texas, Arizona, New Mexico, Utah and Colorado, with the terrain intended to replicate areas where soldiers find themselves operating overseas

Conspiracy theories: A host of wild theories have sprung up as explanations about why the military is carrying out training exercises in Bastrop, Texas

While such views represent the fringes of American political opinion, they reflect a broader suspicion of the federal government that has run deep in Texas for years.

The U.S. Army Special Operations Command exercise, called Jade Helm 15, has brought these fears to a crescendo, particularly in Bastrop.

Some of the exercises, scheduled from July 15 to September 15, will be held in this city located east of Austin.

At an April town hall meeting in Bastrop, attendees peppered a military spokesman with pointed questions, including: 'Are you planning on detaining or rounding up any American citizens?'

Rosalie Howerton, a 74-year-old retired nurse from Tyler, Texas, wrote the governor to say she was worried about the drills.

'I've gotten to the point where I don't trust my government,' she said. 'I don't trust Obama. I think he is looking toward calling martial law to stop the next election from taking place.'

Lieutenant Colonel Mark Lastoria told KXAN: 'We are going to be doing this, conducting the training exercise safely and courteously. We are not going to interfere with their privacy or their rights with this'

In an online comment about Jade Helm, Bastrop resident Josh Munyon wrote: 'It's something that the rest of the country should be worried about. They already have FEMA trains that oddly enough look like the trains that the Nazis used in ww2.'

'I've gotten to the point where I don't trust my government. I don't trust Obama. I think he is looking toward calling martial law to stop the next election from taking place.' Rosalie Howerton from Tyler, Texas

One particular sticking point has been an Army map that lists Texas as 'hostile' territory.

'Such labeling tends to make people who have grown leery of federal government overreach become suspicious of whether their big brother government anticipates certain states may start another civil war or be overtaken by foreign radical Islamist elements which have been reported to be just across our border,' Louie Gohmert, a Republican congressman from Texas, said recently in a statement.

The Texas Republican Party platform has long reflected concerns over federal and international overreach, with calls for a U.S. withdrawal from the United Nations and the elimination of the Federal Reserve.

When a U.N. agency named the Alamo, the location of a famed 1836 battle in the fight for Texas Independence, a World Heritage Site earlier this month, some Texans saw the move as a prelude to an international takeover.

The U.S. Army Special Operations Command has categorically denied there is anything nefarious about the drills, saying they are training exercises, while Wal-Mart Stores Inc said there was no truth to the rumors of a tunnel network being built under its stores.

Location: Some of the exercises, scheduled from July 15 to September 15, will be held in Bastrop and other areas nearby shown here on this map

Land use: Jade Helm will be held on public and private land, in Bastrop and other areas with the permission of landowners, the military said

Jade Helm will be held on public and private land, with the permission of landowners.

The military said Army Special Operations Forces will train in Texas, Arizona, New Mexico, Utah and Colorado, with the terrain intended to replicate areas where soldiers find themselves operating overseas.

Fears from constituents, however, have drawn a response from politicians eager not to alienate right-wing voters.

In a move a Dallas Morning News editorial called 'cringe-worthy,' Governor Greg Abbott, a Republican, said he would dispatch the Texas State Guard to monitor Jade Helm to make sure it does not impinge on Texans' freedom.

'It's something that the rest of the country should be worried about. They already have FEMA trains that oddly enough look like the trains that the Nazis used in ww2.' Josh Munyon

Placating such views could pay off for Republicans, who dominate state politics and often fight their most difficult battles in primaries where campaigns typically take a hard turn to the right.

A poll from the Texas Tribune and the University of Texas showed that 39 percent of registered voters and 85 percent of the right-wing Tea Party group supported Abbott's move on Jade Helm.

'Republican leaders don't want to do something that antagonizes these groups to such as extent that they rally around an opponent in the Republican primary,' said Mark Jones, who chairs the Department of Political Sciences at Rice University in Houston.

'The conspiracy theories tend to get amplified in Texas because we are a large state, with very active groups.'

Leutenant Colonel Mark Lastoria told KXAN: 'We are going to be doing this, conducting the training exercise safely and courteously.

'We are not going to interfere with their privacy or their rights with this.'

Monitoring: Governor Greg Abbott, a Republican, said he would dispatch the Texas State Guard to monitor Jade Helm to make sure it does not impinge on Texans' freedom

Despite the predictions of doom, many Bastrop residents are wary but not overly concerned.

'We support our military, and they have to train somewhere,' said Pam Ferguson, owner of the High Cotton antique store. 'It might as well be here.'

And while suspicion of the drills has run rampant among customers of Crosshairs Texas, the town's only gun store, sales there have not increased, said owner Troy Michalik.