Conscription: equality ends at the draft notice

If the state can order a man to suspend work, family life, and his own plans, enter military service, and if necessary risk his life, while a woman of the same age retains a choice, that is a sex-specific duty. People can argue about whether conscription should exist at all. They cannot coherently remove it from the measurement of gender equality.

The legal test is simpler than the rhetoric: who may tell the state “no” without a special exemption, and who may not?

Equality indices left the draft out

Economists Jussi Heikkilä and Ina Laukkanen examined major international gender-equality indices and found a straightforward omission: none accounted for mandatory peacetime conscription imposed on only one sex. A country could compel men to serve and lose no points for it in its measured gender equality.

Their Nordic comparison made the blind spot visible. In the period studied, Finland and Denmark had male-only conscription, Norway and Sweden had obligations covering both sexes, and Iceland had no conscription. The indices did not register that difference. The paper does not establish the “correct” weight for military duty; weighting is a normative choice. It establishes that the effective weight was zero.

One detail from the paper is now historically stale in a useful way. Denmark made conscription fully equal for men and women on 1 July 2025. A country the paper used as an example of male-only duty has since changed the rule.

Pregnancy is not a draft notice

Pregnancy and childbirth carry a real physical cost. They are not, however, legal obligations imposed by the state on every woman in an age cohort. Conscription does impose a legal obligation on men in systems that draft by sex.

Jay Teachman, Lucky Tedrow, and Carter Anderson used NLSY97 longitudinal data and found that military service delays childbearing for both male and female recruits, with a larger effect for women. The effect persists after leaving the military but diminishes. The authors did not conclude that service necessarily reduces completed lifetime fertility; the clearer result is postponement.

Reproductive biology therefore supports exemptions and temporary restrictions for pregnancy, postpartum recovery, and specific medical conditions. It does not establish a blanket exemption for women as a class. A medical limitation should apply to the person who has it, rather than treating half the population as presumptively unfit for every military or civil-defense function.

“One man can impregnate many women” works better on paper than in a society

Biologically, one man can father children with several women. That observation is sometimes turned into a demographic claim that losing men barely limits reproduction. Postwar evidence does not behave that way.

Elizabeth Brainerd studied the enormous male shortage created by World War II in the Soviet Union. Among people aged 20–29, the male-to-female ratio fell from about 0.91 in 1941 to 0.65 in 1946. Cohorts and regions facing greater male scarcity saw lower marriage and fertility, more nonmarital births, and weaker bargaining positions for women in the marriage market. Her long-run check using postwar cohorts in Belarus and Ukraine also linked more severe male scarcity to lower completed fertility, more childlessness, and a larger share of women who never married.

German evidence adds an important qualification. Kesternich, Siflinger, Smith, and Steckenleiter followed fertility over the life cycle. A shift from ten men per ten women to nine men per ten women was associated with about 11.5% fewer children by age 28. Mothers later caught up, and among women who did become mothers completed fertility eventually exceeded that of women from more balanced cohorts. But the probability of remaining childless stayed higher.

The defensible conclusion is not that fertility becomes impossible without equal numbers of men. It is narrower and stronger: men are not interchangeable sperm supply. Male scarcity disrupts pair formation, postpones family formation, raises childlessness, and changes the marriage market. Some fertility loss can be recovered later; some cannot.

Average strength is a reason for standards, not a sex marker on the application form

Men are stronger and have greater aerobic capacity on average. That matters in physically demanding combat jobs. An average, however, does not tell an army whether a particular person can perform a particular task.

A U.S. Army study covered 4,384 men and 363 women in operational light-infantry units. Raw injury incidence was higher among women, 53% versus 42%. After adjusting for age, body fat, physical-test performance, and occupational physical demand, sex no longer predicted injury. Slow running, age, and higher body fat were better predictors.

This study does not prove equal suitability for every combat task. It supports a more useful rule: one job, one job-relevant standard. If a woman fails it, do not assign her. If a man fails it, do not assign him either. Sex should not substitute for testing the capacity the job actually requires.

Women in combat units: what the newest causal evidence actually measured

The United States opened infantry and armor occupations to women in 2016. Kyle Greenberg, Melanie Wasserman, and E. Anna Weber used the staggered integration of women into 391 previously all-male combat companies as a natural experiment. Their 2026 Quarterly Journal of Economics study found no deterioration in men’s retention, promotion or demotion, misconduct separations, criminal investigations, or medical readiness. Men’s physical-fitness scores fell by 1.8 points, about 0.7% of the mean, but the pass rate did not fall.

About 22% of integrated companies deployed to combat zones within two years; the measured administrative outcomes again showed no negative effect. That does not justify the slogan that women have been proved equally effective in direct combat. The authors explicitly lacked a direct measure of company performance in actual combat or controlled combat training. During the study period U.S. forces were mostly training, advising, and assisting local forces, and combat casualties were too rare to provide such a test.

The study defeats a narrower claim: the presence of women who passed gender-neutral entry and occupational requirements did not measurably degrade the readiness indicators the Army could observe.

In Russia and Ukraine this is not a thought experiment

Russia’s Federal Law No. 53-FZ subjects male citizens aged 18–30 to compulsory military service. Women may serve, but being female does not create the matching compulsory duty.

Ukraine makes the wartime asymmetry even clearer. The Ukrainian Ministry of Defence states that, as a general rule, men liable for military service aged 25–60 are subject to mobilization when fit and without a deferment or reservation. Women on the military register may be called for military duty or defense work during wartime on a voluntary basis. Telling a Ukrainian man that he “also has the right not to serve” simply misstates the current rule.

Sex-neutral duty already exists

A symmetrical system does not require inventing a new military model. Norway introduced universal conscription covering both sexes in 2015. Sweden resumed a gender-neutral conscription system in 2017, while its broader total-defense duty applies equally to women and men. Denmark has now joined them, calling men and women on equal terms and allowing either sex to be ordered into service if volunteers are insufficient.

Equal duty does not mean identical jobs. Armed forces need infantry, drivers, engineers, medics, communications, intelligence, logistics, and civil defense. Capability should be tested after the state has first treated the person as a citizen rather than exempting one sex in advance.