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In the present fast-paced and globalized age of war, special operations forces have a comparative advantage over conventional forces because of their small, highly-skilled units. Largely because of these characteristics, special operations forces spend a disproportionate amount of time deployed. The amount of time spent deployed affects service member’s quality of life and their level of preparedness for the full spectrum of military operations. In this paper, the authors ask the following question: How many force packages are required to sustain a deployed force package, while maintaining predetermined combat-readiness and quality-of-life standards?

The authors begin by developing standardized deployment-to-dwell metrics to assess the effects of deployments on service members’ quality of life and combat readiness. Next, they model deployment cycles using continuous time Markov chains and derive closed-form equations that relate the amount of time spent deployed versus at home station, rotation length, transition time and the total force size.

The expressions yield the total force size required to sustain a deployed capability.

Finally, the authors apply the method to the US Air Force Special Operations Command. This research has important implications for the force-structure logistics of any military force.

The purpose of this paper is to describe the major factors affecting health during pregnancy, birth and the postnatal period and outline the evidence for interventions to improve outcomes in women and their children.

Selective review of the literature. A number of electronic bibliographic databases were searched, including the Cochrane Database of Systematic Reviews, PubMed and PsycINFO, for relevant studies published since 1990. Papers were restricted to those published in English which presented data from studies conducted in high-income countries, with priority given to systematic reviews, randomised controlled trials and other quantitative studies which present a higher level of evidence.

Many factors may affect maternal and infant health during and after pregnancy. Potentially modifiable factors with an evidence base to support intervention include improving diet, and the avoidance of smoking, alcohol and illicit drugs. Good clinical management of underlying illness is also important, along with attempts to engage women in improving health prior to conception and postnatally rather than once pregnancy is established.

The evidence base for interventions on some potentially modifiable risk factors is incomplete. There is good evidence of benefit from some health behaviours such as smoking cessation and uptake of breastfeeding and accumulating evidence of the benefit of some models of maternity care.

Good maternal health during and after pregnancy plays a key role in giving the child a better start in life. Improved health behaviours are vital but often these are heavily dependent on social context and hence working to tackle social inequality and provide maternity care tailored to individual need is likely to be just as important as trying to directly alter behaviour.

Pregnancy and the postnatal period present an opportunity to improve maternal health and have a positive effect on future child health. Greater investment is required in this antenatal period of life.