In peace time, the US government used to spend very little on defense, about one percent of GDP. But that changed after World War II when the United States found itself in a global contest against Communism. Ever since, defense spending has never been less than 3.6 percent of GDP.ut 9/11, the terrorist attack on iconic US buildings in 2001, changed that, and defense spending began a substantial increase in two stages. First, it increased to 4.6 percent by 2005 for the invasion of Iraq, and then to 5.0 percent in 2008 for the the surge in Iraq.
The most noticeable difference is the sensation. A whirlpoolâs water jets come with the classic, high pressure, deep massaging jets that most people have come to associate with hydrotherapy. An air tub, on the other hand, is a more generalized, effervescent feeling.he most noticeable difference is the sensation. A whirlpoolâs water jets come with the classic, high pressure, deep massaging jets that most people have come to associate with hydrotherapy. An air tub, on the other hand, is a more generalized, effervescent feeling.
At first glance, there doesnât seem to be much difference between whirlpools and air tubs. Both provide jet massages in a tub. But once you are in the market for one or the other, you will quickly realize that there are some important variances between a whirlpool tub and an air tub.oth are relatively simple to clean. For a whirlpool, simply add in a cleaning solution (store bought or homemade) and run the jets for a few minutes. Itâs also important to remember to never run a whirlpool unless it is filled. An air tub, on the other hand, is self-drying and is thus self-cleaning.